Monday, October 5, 2009

Exotic Bananas




Banana Plant Descriptions...
The following list of descriptions gives some of the characteristics, and heights, grown in our area, of most of our varieties. Please note that the area of the country and growing conditions such as soil type & pH, temperature, humidity, amount of sunlight, fertilizing practices, amount of water and drainage will effect the size and health of your plants. Follow growing instructions carefully to get them off to a good start. Early care and frequent nutrition produce the best results for your plants and the most satisfaction to you, our customers.
AEAE - (waiting list only) A beautiful variegated green & white plant that also has multicolored fruit. Usually cooked as a plantain, some also eat it very ripe as a out of hand fruit. Ht. 12-16ft.

AFRICAN RHINOHORN - Height 10-12 feet. An unusual plantain that produces relatively few fruit but the size of each can weigh 2-3 pounds and be as long as 12-20 inches or more. The pseudostem has a dark burgundy hue which gives rise to the term some call "African Red". A collectors delight, especially when fruiting. Cold sensitive.


BACCARII— Ornamental banana that grows about 6-8 ft tall. Narrow light green leaves, with a bright orange/red torch inflorescence with green tips. Stunning!

BALBISIANA - The second of the primitive seeded varieties thought to be an ancestor to many modern day bananas and plantains. This hardy banana makes a nice landscape and collector variety. Height about 14-16 ft.

BALONGKAUE - (pronounced ball long coo) is a cooking type which grows about 12 ft. tall. The fruit has a bluish/green outer appearance, with white flesh. Is a very sturdy and attractive plant that can be eaten out of hand when very ripe.

BANKSII - (pronounced bank-see-aye) Also primitive seeded species having long thinnish leaves with light brown coloration on sheaths & lower petioles. Grows about 8-10 ft. Collectors & landscapers like these.

BALBISIANA
A disease resistant variety that bears a seedy fruit but the plant is valued for its use in banana breeding for new and improved banana varieties. Balbisiana is hardy and makes a wonderful landscape plant. Seeds from the fruit sprout readily and grows to a height of 14-18 ft.


BASJOO - This cool tolerant, seeded variety grows about 12 ft. tall, is solid light green and is a fast growing sturdy plant. It frequently sends out rhizomes 2-3 feet away from the corm. It has a golden-cream colored ovate inflorescence making it a very attractive acquisition. Becoming more popular in cooler regions for a tropical appearance.

BRAZILIAN - One of the tastiest of the dessert bananas, in our opinion. The height is 14-16 feet but has Dwarf brother that grows only 7-9 ft. and produces the same superb fruit. A real favorite for appearance and flavor.




BRUNEI - (pronounced brun eye) This ornamental sometimes called "black rose" grows about 12 ft.. The unique dark pseudostem contrasts with the inflorescence of dark red-rose color to be quite stunning. The seeded 2 inch fruit add to the beauty of the plant. very limited quantities

BURMESE BLUE - Although primarily thought of as an ornamental, some people from Burma, Thailand & Laos cook with it. Does not fruit easily occasionally needs pollination to get fruit. very limited quantities


CARDABA - A Philippine cooking variety that is a truly an attractive plant with a bluish hue to the fruit and very white pulp. The fruit is stubby and irregular in shape but can get quite large. Height 10-12 ft.

COCCINEA - (also known as uranoscopus) This ornamental variety produces an erect inflorescence of brilliant red-orange color that lasts for weeks. Height 3-6 ft. Good for containerized growing in filtered light.

CAVENDISH - Both the Dwarf (5 ft.) and Giant (7-8 ft.) varieties produce wonderful tasting fruit as does the others in the Cavendish sub-group. A vigorous grower with wide green leaves. One of the more common grown varieties in the USA.


DWARF NAMWA - Also known as pisang awak and other names through out the world, this group of lady finger bananas produce large sized bunches of sweet, truly delicious, fruit that is prized in Indonesia and all over the world. Usually grows about 9-10 ft although may grow a little taller.

DWARF ORINOCO - Named from the region in South America near the Orinoco river where they grow profusely, they are also called the horse banana or "burro". These angulated cooking bananas are also a tasty treat out of hand when fully ripe. Their versatility make them popular in many regions of the world. Height 5-6 ft. dwarf & 12-14 ft. on the tall.

DWARF & TALL RED - Known by many names in the world, (Cuban Red, Jamaican Red, Colorado, Indio, Macaboo) this very sweet lady finger fruit is most beautiful. It turns "sunset" colors when ripening from dark burgundy to orange, yellow-green and muted colors in between. The full bodied flavor and distinctive sweetness makes it worth the wait of 24 months or more to give fruit. The tall red, with a dark maroon pseudostem can grow 14-16 ft, the Dwarf version grows about 8-9 ft in our area.

DOUBLE - This beautiful Cavendish type has very wide, dark green leaves and produces a full sized fruit. Also called the Mahoi, the second generation produces multiple bunches of fruit, usually 2 but sometimes more. Height 5-6 ft.

ELE ELE - A Hawaiian cooking variety that is known for its very dark pseudostem. Sometimes called the Hawaiian Black, it gets a purplish hue, especially in more acid volcanic type soil. Full sized fruit. Grows about 14 ft. tall.

EBON MUSAK - A rather unique variety in that it has fruit that does not turn yellow when ripe only a subtle color change takes place when the fruit is mature. Watch it closely for plumpness so that it does not become over ripe. The nice sub-acid flavor makes it a delicious treat. Height 10-12 ft.
ENSETE MAURELII- Beautiful ornamental banana-like plant with very large upward extending leaves. Burgundy coloration in the leaves and midribs that can vary, like the heights, depending on light and other growing conditions. Usually propagated by seed, rather than rhizomes, which are very rare.

GOLDFINGER (FHIA-1) - A rapid growing, mostly green plant producing a wonderful tasting, slightly sub-acid, refreshing fruit that gets 6-8 inches long or better. It is a very disease resistant, wind & cool tolerant plant that is easy to grow. In our area the ripening fruit does not get dark yellow, instead gives only a slight color change when mature so check it often when close to harvesting. Height 10-12 ft. This one is a MUST.

FRENCH HORN - This plantain is much favored in Ecuador and the West Indies; used as a staple in their diets. The slightly curved fruit is large and delicious, comparable to the commercial plantains that we know and adore. Height 12 ft.

GIANT PLANTAIN - A taller version of the "Puerto Rican DWARF PLANTAIN". Both producing a superior fruit and commonly used for "maduros" and "tostones", a staple in the Caribbean and Hispanic cuisine. This is the one you find in the super market. Heights 12ft. and dwarf 8 ft.

GOLDEN AROMATIC - A Cavendish type sweet banana that has a fragrant aroma and gold ripe fruit. The full sized fruit produced from this wide leaved plant is a real taste treat. Height 10-12 ft.

GRAND NAIN - The commercial variety that you can buy in the grocery store. The purchased ones are good but when you grow it yourself and see how delicious this banana can taste you wonder what took you so long to try. These full sized fruit ripen rapidly, so be ready. They can give 40-60 pounds of fruit with ease. Height 6-8 ft.

GRAND NAIN-X-SUMATANA - (We just call it the "X") It has beautiful large leaves with maroon under side and splotched maroon and green on the top side of the leaves. Resembles the Zebrina except larger leaves and fuller. Height @ 6 ft.

Haa Haa
A striking plant which bears medium bunches of delicious fruit with orange flesh. A rare form of the Iholena Family. Height 10' to 12'.

HUAMOA - A Polynesian cooking banana that is almost rectangular in shape and packed with flavor. These make wonderful tostones as well as other banana recipes. The large full leaves and fat, rounded fruit make this a great looking plant. Height about 12 ft.


ICE CREAM - A very beautiful, cool tolerant plant that produces a blue/green fruit with pure white flesh. The sweet creamy fruit is very delightful. Height 10-12 ft.


IGCPOCA - One of our newer bananas that gives a plump, sweet delicious light green fruit with a pointed end. A thumbs up in every way. (Pronounce it if you can) Height 10-12 ft.

KOFI - From Papau New Guinea, a member of the Iholena sub group which is a combination cooking-dessert banana that rated highest in tasting tests. very limited quantities

KRU - Brought into this country from New Guinea, this wine colored plant gives fruit with green & red markings that narrows to a point on one end giving it an interesting and beautiful appearance. The fruit must be eaten very ripe to get full flavor. Grows about 12 ft. tall. The Green Kru is the same flavored fruit with out the wine colored markings.


LACATAN - Both the Jamaican and cousin Philippine Lakatan are one of the Cavendish sub-group and produce a similar fruit in shape, texture and flavor. Only the height of the plants differ slightly; the Philippine has more red in the leaf margis and is a little taller. Both produce good sized bunches of fruit that has delicious flavor. Heights (J=12+ft. P=14+ft.)

MAIA MAOLI - This 12-14 ft. tall plant of the Polynesian cooking variety has delicious flavor and statuesque elegance. It is mostly green with slight red colors in the pseudostem giving serious competition to the other cooking varieties. (One of our favorites)

MALACCENSIS - A primitive species, producing a small thin seeded fruit of about 4 inches. Resistant to Panama Disease and Sigatoka. Grows about 8-10 ft. tall.

MANNII - Short, approx. 3ft Ornamental plant having a small pinkish-blue inflorescence. Looks great in clumps adding color to the landscape

MAQUEÑO - N/A AT THIS TIME A cooking banana from Ecuador, has a solid greet stout trunk with chubby 6-8 inch fruit. Height 12 ft. The plant is resistant to sigatoka and other diseases making it a good substitute in countries where this is a commercial problem.

MAURITIUS - A short Cavendish type plant that grows 4 ft. in height and produces a small bunch of sweet full sized creamy fruit. Great for containerized growing or small area.


MONKEY FINGER - A terrific looking plant that produces very large bunches of long thin bananas with slight curving. It truly resembles the elongated fingers of a large monkey hand and hence obtained its name. The fruit is firm and sub-acid sweet giving it a very refreshing flavor. Height 10-12 ft.

MONTHAN - A cooking type from South India. Similar to the Bluggoe or Orinoco in size and versatility. Height about 10-12 ft.

MYSORE - (Height 14-16 ft.) and MISI LUKI (Height @ 10-12 ft.) are 2 of the most popular and delicious lady finger bananas we have tasted. The mysore, from India is an important commercial crop for that area of the world. The Misi, has a very fruity flavor. The shelf life of these delicious little morsels out last any other by several days. They are sturdy and fast growing. Loved by all!

MUSELLA LASIOCARPA - This short, stout, ornamental banana like plant is a prolific grower with tight clustering leaves. It produces a golden-yellow inflorescence emerging from the center & extending upward like a crowned jewel. Flower lasts about a month. Beautiful and Unusual. Approx. 4 ft. tall.

NEHUMBAHOKA - A rare dessert banana that grows about 10-12 ft. tall with a large amount of "chocolate" coloration in the pseudostem. The fruit is plump, at about 5 inches long & narrowed at the tip. It has sub-acid flavor which makes it refreshing.

NINO - This delicate sweet, thin skinned baby banana produces a fruit about 4 inches long. It is a light green plant that grows to about 8-10 ft.

ORNAMENTALS - ORNATAS- Some of several flowering colorful beauties that are a bold addition to landscape or gardens. The erect flower extends upwards through the lush greenery and peeps out with color. We carry the Bronze, (also called Laterita), Dusky Rose, Magenta, Pink Ornata and Red at this time. All magnificent. Heights 5-7 ft.

PELIPITA - A dark green plant that grows about 10-12 ft. tall and produces a cooking banana that is angulated in shape. It is a hardy plant resistant to disease which is why it is used as a progenitor for many other hybrids.

PISANG JARI BUAYA - This hardy dessert variety grows about 8-10 ft. tall with long leaves and a thin pseudostem. The fruit is slender and long with a slightly sub-acid sweet fruit. Rare and unique.

PITOGO - A wonderfully different looking fruit that resembles a fig more than a banana. Its ping-pong ball looking fruit is as delicious as it is unusual. We can't keep enough ahead of the demand. A real conversation piece as well as a special treat. Grows about 10-12 ft. in height.

POPOULU - A 12-14 ft. Polynesian cooking banana with superb flavor. Its short stout fruit and dark green foliage make it a magnificent looking specimen as well as great tasting treat.

PRAYING HANDS - Now here is a real eye popper. The fruit is fused together making each hand look like a baseball mit or hands in the praying pose. When completely ripe it is possible to separate the fingers to reveal a great tasting vanilla flavored banana. A must for the real banana enthusiast. Height 12-14 ft.



PISANG RAJA - A wonderful Indian variety with a yellow-orange flesh and sweet delectable flavor. Once you have tasted this baby you're hooked on this 14 ft. delicacy. Firm and delectable with an unforgettable taste.

RAJA PURI - A very popular sturdy plant originating in India and becoming a favorite around the world. Due to the rapid growth and delicious taste of these 3/4 size fruit as well as cool tolerance they have won the hearts (and taste buds) of thousands.

RED IHOLENA - This versatile variety is not decorative, with the under side of the leaves a burgundy color, but also used for eating fresh, dehydrating and for cooking. Others in the Hilahila sub group of Polynesian cooking bananas include the WHITE IHOLENA (& HA'A not available at this time) that produce fruit that are yellowish from the onset, making it difficult to determine when to harvest. These are devoid of the burgundy coloration but produce the same fruit. All are excellent for a multitude of uses. Heights: Red 10-12 ft, White 8-10 ft.

ROSE - One of our latest acquisitions and a real beauty. The slender pseudostem displays a soft reddish color and grows rapidly. The small fruit are very sweet and delicate. Resistant to fusarium wilt, grows 6-8 ft. tall.

SABA - The "sequoia" of the banana plants with huge pseudostem (range 20"-45" diameter) and heights ranging from 16-20 ft. here, however clients have reported even greater sizes in other growing areas of the country. The wonderful tasting cooking banana makes the best tostones we have ever eaten. A sturdy plant and somewhat cool tolerant. (A must for the collector and those that want BIG)

SUPER DWARF - A real midget banana growing about 3 ft. tall with wide leaves and green coloration. It produces a small bunch of medium - large fruit. Great for containerized growing or small spots in the yard or garden. A real cutie.

SIAM RUBY* - A new member to our collection this year. Has beautiful RED leaves, top & bottom that vary in color depending on the amount of sun it gets. Great for that splash of color in the landscape and gives bananas too. I can't comment on the fruit or flavor as of yet, still awaiting our first harvest. We have great expectations for this beauty.

TEXTILES - Also known as the Abaca and Giant Pisang is a seeded variety that is used primarily for its fiber in the Philippines for making hemp rope. It is disease resistant, grows about 16 ft. in the US & has a beautiful golden inflorescence.

THOUSAND FINGERS - This novelty is as unique as beautiful. When full grown at 10-12 ft. It produces a stalk of tiny round bananas that can continue to make fruit until it touches the ground (sometimes 5 ft. long or more) Mostly used for ornamentation or landscape however the fruit is edible. (If you are patient)


TRULY TINY - a cute and sturdy plant that grows about 3 ft. Tall and produces an edible but small raceme of mild flavored, medium size fruit. A great addition to patios, container growing, or borders.

TUUGIA - An unusual plant in that it produces a full sized, thin fruit that has a slight "s" shape. A fast growing variety with a light green pseudostem and reproduces rhizomes rapidly. Height 10-12 ft.

VALERY - One of the Cavendish varieties that produces a full sized fruit with a creamy texture. A midsize plant good for backyard treats for the family. Height 10 ft.

VELUTINA - This small ornamental, 3-6 ft. is a gorgeous thin leaved green plant that produces a small, hot pink, fuzzy banana that stands erect (australimusa). When it is mature it peals itself back exposing a white seeded fruit just ready for the plucking. Use care if eating, the seeds are like a buckshot and could easily chip a tooth.

VEINTE COHOL* - A dessert variety originating in the Philippine area and having green pseudostem with some brown patches. The small plump fruit (3-4") are soft and sweet. Height about 8-10 ft. Current research shows it to be a cool hardy and rapid to fruit, a real plus in the short summers. This is what you have been asking for, one that fruits fast before the warmth is gone for those short growing seasons!

WILLIAMS - A Cavendish type that produces a full sized fruit with excellent flavor. An all 'round favorite. Grows about 8-10 ft. in height. A popular variety for good reasons.

WHITE IHOLENE
The plant of the White Iholene is light green and covered with waxy flakes of excess chitin that gives it a white appearance. There is only a slight hint of burgundy color beneath the leaf and definite line on only one margin of the bottom of each leaf. Heads of fruit are about 30 pounds consisting of eight to ten hands when well raised. The fruit has a large gradient between the larger fruit of the top hands and the smaller fruit of the bottom hands

YANGAMBI KM-5 - (Sometimes just called the KM-5) An excellent tasting small dessert banana from West Central Africa. It is very disease resistant and sturdy. Height about 12 ft.

ZAN MORENO
A dwarf Cavendish sub type that produces a sweet, creamy great tasting fruit. Height about 5-6 ft.

ZEBRINA - Also called the Sumatrana, Blood (and sometimes the Rojo, although incorrectly) This ornamental maroon & green variegated leaf banana produces a very tiny dark maroon seeded fruit that is cute to look at but not edible. It adds a little color to all tropical landscape. Is especially nice around decks & pools. Height 6-8 ft

Priced well over a half million dollars, this huge fine tsavorite is one of the most valuable gemstones ever to be discovered in East Africa


An exceptional gemstone, probably the largest fine color clean Tsavorite in the world was found near Arusha, Tanzania at the border of the original block B tanzanite mining area, (Block B extension), at a depth of 160 meters. The area is locally known as Karo. Even with a loupe, this stone is extremely clean. One or two other larger tsavorites have been unearthed in the last two or three years but they are lighter in color and the medium green color of this stone is better than any other stone in a similar size range.
Material like this has also been referred to as Meralani Mint Garnet but in such a large size, the tone becomes much darker and is no longer mint like at all. Weighing 120.68 cts., the cutting and proportions are good with no windowing and superior transparency. The stone was step cut in Thailand and measures 34.70 x 25.30 x 17.50mm.
At the Basel show from now until April 6, the stone can be viewed at Abouchar SA, Hall 3.0, Booth L 60 and is also being offered on-line at www.multicolour.com.

Tsavorite


First discovered in Kenya in 1968 Tsavorite was the first Green Garnet the world had known since small Russian deposits of Demantoid Garnet had run out in the late 19th century. Today Tsavorite's gorgeous bright green shades are rapidly growing in popularity as new digs in both Kenya and Tanzania turn up fabulous new sources.

Named for the Tsavo National Park - one of the world's largest wildlife sanctuaries, where hippos and crocodiles luxuriate in the Mzima Springs while snakes and man-eating lions do their utmost to scare gem-miners away!

Tsavorite is a green variant of grossular garnet (Ca3Al2(SiO4)3) which gets its coloring from vanadium &/or chromium impurities. Tsavorite is a robust gem suitable for all jewelry types.

Refractive Index : 1.74
Specific Gravity : 3.60-3.68
Moh's Scale of Hardness : 7-7.5

Garnets are a group of related minerals, containing cubic crystalline structure with slight variations in their chemical compositions. In all, there are 7 major types of Garnets, which include Almandine, Pyrope, Spessartine, Grossular, Andradite, Rhodolite and Malaia.


Tsavorite ranges from light green to very dark. The finest stones are eye clean with an intense medium green color. Tsavorite has grown tremendously in popularity in recent years as more stable supplies have reached the world market.

When evaluating all types of Garnets, color is the most important characteristic. The color must be intense and uniform with a tone that is not too light or too dark. Fine Garnets should be eye clean with minimal inclusions under magnification. Size is also a very critical determinant of the stone's value.

Thursday, October 1, 2009

Reference This page is http://www.ruby-sapphire.com/links.htm

Gem and Jewelry Sites
Gemological Training Institutes, Laboratories and Related Sites
American Gem Trade Association Gemological Testing Center – Gem testing lab of the AGTA and former home to Ruby-Sapphire.com's Richard W. Hughes. Sign up for their regular gemology updates.
Accredited Gemologists Association – Private US-based gemological organization
American Gem Society — Important diamond lab and jewelers’ association
American Gem Trade Association – The chief trade association for US-based colored stone dealers and parent association of the AGTA GTC.
Asian Institute of Gemological Sciences – Thailand’s first gemology school and lab and alma mater of RWH.
Aventures Cristallines – Gorgeous gemscapes from Bruno Cupillard.
Canadian Gemmological Association – Canada’s national gemology association
CISGEM – Italy’s best known gemological lab
Diamondse.info – Nice site for diamond lovers
Gem and Diamond Foundation – Great site about gems and jewelry.
D-Gem-G – Germany’s oldest and most famous gemology institute and lab
Field Gemology – The personal site of French gemologist extraordinaire, Vincent Pardieu. Some great stuff here.
Gem and Jewelry Institute of Thailand – Bangkok-based government gem lab and school
Gemlab.net – Well-equipped Liechtenstein-based gem lab
Geminterest.com – A very nice French gemology and mineralogy site
Gemmological Association of Great Britain
Gemmological Association of All Japan (GAAJ)
Gemmological Association of Australia
Gemmological Institute of India – India's oldest gemological school
Gemmology World – Canadian Institute of Gemmology
GemologyOnline.com – Great online gemological resource
Gemological Institute of America (GIA) – US gemological giant
Gübelin Gem Lab – Site of the world-renowned Gübelin Gem Lab
HRD – Diamond High Council, Antwerp, Belgium
IBGM – Instituto Brasileiro de Gemas e Metais Preciosos – Nice Brazilian gem site
International Colored Gemstone Association
IGE – Instituto Gemológico Español – Spanish gemological institute
International Gem Society – Gemological site
Institut Gemmologique de France – Lyon, France-based gemological institute
LabGem – Portuguese gem laboratory
Laboratoire français de Gemmologie – Paris gem lab
MicroWorld of Gems – The stunning web site featuring the award-winning inclusion photography of John Koivula.
Mindat.org – Fabulous site, probably the best site for mineral data on the web
Minerapole.com – Site for the famous Sainte-Marie aux Mines mineral show in France
Pegmatite Interest Group – For the pegmatite lovers out there.
Pricescope – Great online forum devoted to gems
Russian Gemological Server – Business, research and educational projects in gemology
Scottish Gemmology
Swiss Gemmological Institute (SSEF) – One of the world’s top gem laboratories
University of Texas Gemology Program – Very nicely done pure gemology
Gemological Instruments
Adamas Gemological Laboratory & Gemological Software – Marty Haske's diamond spectrophotometers
GIA GEM Instruments – Gemological instruments and books from the GIA
GemEx Systems, Inc. – Makers of the GemEx (formerly Lambdaspec) gem imaging spectrophotometer
Gemological Products Co. – Gem-testing gear from Jeff Wildman, inventor of the PortaLab
Krüss – German gemological instrument manufacturer
System Eickhorst – The famous German gemological instrument manufacturer
Press – Gem, Jewelry & Mineral Magazines
American Jewelry Manufacturer (AJM) – Magazine devoted to jewelry arts
Australian Gemmologist – Journal of The Gemmological Association of Australia
Colored Stone – Magazine devoted to the colored stone gem business
Diamond Intelligence Briefs – Magazine covering the diamond industry
Instore Magazine – Magazine for the American jewelry store owner
Gems & Gemology – The world’s finest gemological publication, from the GIA
The Guide – From Gemworld International, publishers of The Guide, the best price guide to gems
IDEX Magazine – Israel-based magazine covering the diamond and gem trades
Jewelers’ Circular-Keystone – Famous trade magazine
Jewelry Lady – Regular column from America’s favorite gem babe, Debbie Yonick
Jewellery News Asia – Asia’s best jewelry trade magazine (registration required)
Lapidary Journal – Magazine devoted to jewelry and lapidary arts
Lapis – Outstanding German magazine devoted to minerals
Mineralogical Record – The finest magazine devoted to the mineral collector
Modern Jeweler – Magazine for the American jeweler, featuring noted gem journalist, David Federman
National Jeweler – NYC-based jewelry trade magazine
Rapaport.com – Famous diamond price sheet; also has news about colored stones
Rocks and Minerals – America’s oldest popular mineral magazine
Gem & Mineral Book Dealers
Earthlines – Earth sciences books and accessories
Gem Book Publishers – Publishers of Fred Ward's famous gem book series
The Gemmary – Used books on gems and minerals
Geoscience Books & Prints – Out-of-print books on gems and minerals
GIA GEM Instruments – Gemological instruments and books
Ed Rogers – Rare and out-of-print geoscience books
Gem, Jewelry & Mineral Dealers
Pala International – Richard Hughes' home, selling the best in fine precious stones, jewelry and minerals, with an unparalleled range of Burmese gems and crystals
The Collector – Retail division of Pala International, selling fine jewelry, mineral specimens and gems
Gem & Jewelry Networks
Ganoksin – One of the foremost information jewelry manufacturing resources on the Internet
Polygon – Gem trading and information network
Rapaport – Gem trading and information network
Gem & Jewelry Appraisers
For a comprehensive online search engine of US-based jewelry appraisers, see this link:

Find an Appraiser
Gem & Jewelry Appraisal Software
Quantum Leap Software Solutions – One of the finest software packages available in the field of appraisal, from gemologist, Thom Underwood.
Gem & Jewelry Auction Houses
Bonhams & Butterfields – Gem, jewelry and mineral auctions
Christie’s – Gem, jewelry and mineral auctions
Sotheby’s – Gem, jewelry and mineral auctions
Museums with Important Gem, Jewelry & Mineral Collections
Bowers Museum – Featuring the magnificent Michael Scott collection of gems and minerals
Carnegie Museum of Natural History – Hillman Hall of Minerals and Gems, Pittsburgh, PA
Harvard Mineralogical Museum – Mineral museum at Harvard University
Hermitage – Museum in St. Petersburg, Russia houses a magnificent collection of gold and jewels
Houston Museum of Natural Science – Joel Bartsch curator
Los Angeles County Museum of Natural History – Mineral Sciences Dept.
Louvre – One of the world’s finest museums, with many gems on display, Paris, France
San Diego Natural History Museum – Mineralogy Dept. of this fine museum
A.E. Seaman Mineral Museum – Located in Houghton, MI
Smithsonian Institution – Department of Mineral Sciences
Sterling Hill Mining Museum – Located in the famous Franklin, New Jersey area
Tower of London – Home of the British crown jewels, in London, UK
Other Sites of Interest
Afghan Connection – Site of Central Asian specialist, Gary Bowersox
Donnsalt.com – Personal site of the man I regard as the world's greatest jade carver. See also DonnSaltJade.com.
Jadeartnow.com – Fine examples of contemporary jade carving
Kashmirblue.com – Ed Cleveland's site devoted to all things Kashmir and sapphire
Swalagemtraders.com – Site of East African gem speacialists, Mark and Eric Saul

Tanzanite

Introduction
Blue lightning
Ever since Ndugu Jumanne Ngoma stumbled upon shimmering blue crystals in the shadows of Tanzania’s Mount Kilimanjaro, tanzanite has become one of the world’s most sought-after gemstones. No wonder. As anyone who has ever laid eyes on this gem can testify, tanzanite has a take on the blues that can drive even the finest sapphire to kick the nearest dog. And yet, when it was first discovered, Ngoma could hardly give it away:
I found the tanzanite in Merelani, Arusha, in the area called Kiteto at the beginning of January 1967. I was on my way to visit some of my relatives who live in Kiteto, when walking through the bush I saw some crystals of a blue mineral lying on the ground. There were very nice… They were blue, some were transparent… In a few hours I collected about 5kg — they were all very lovely blue crystals.
A friend told me to get on the bus and go to Nairobi… where there was a much bigger gem market than in Arusha. So I borrowed some money for the journey and went to an overseas company who deals in precious stones… and I let them see the 5kg of tanzanite. They didn’t even know what the mineral was. They told me, though, that as soon as they knew, they would let me know. I left them with the 5kg of tanzanite in exchange for a return ticket home, worth $5.… 33 years have gone by and I’m still waiting for their answer! But I kept some samples for myself.
Ndugu Jumanne Ngoma, relating his discovery of tanzanite to author Valerio Zancanella
Following this discovery, tanzanite quickly became one of the world’s most popular gemstones. Some credit is due to Tiffany & Co., who introduced it to market with a lovely name that pays tribute to the beauty of the land of its birth. Tiffany understood that to call this glamorous gem by its mineral name, blue zoisite, would not do it justice.

Today tanzanite is available in a variety of shapes and sizes. Rarely pure blue, tanzanite almost always displays overtones of violet. In smaller sizes, it tends toward lighter shades of lavender and periwinkle, while in sizes above ten carats, tanzanite can show richer, more intense blue colors.
Tanzanite is trichroic, meaning it shows different colors when viewed in different directions. One direction is blue, another purple, and the other bronze. When found in the ground, the bronze color often dominates. However, with gentle heating (~520°C), one can watch the blue and violet bloom and deepen in the stone. The resulting color is completely stable.

Legend has it that the effect of heat was first discovered when brown zoisite crystals exposed on the surface were caught in a fire set by lightning that swept across the grass-covered Merelani hills. The Masai herders who drive cattle in the area noticed the beautiful blue color and picked the crystals up, becoming the first tanzanite collectors.
Owing their color to traces of the element vanadium, cut stones with more blue than violet tend to be more expensive because the crystals generally form with the blue color axis oriented along the width of the crystal instead of the length. That means that if the cutter chooses to maximize the purity of the blue color, the stone cut from the rough will be smaller and thus cost more per carat. The blue color, however, is so beautiful that the sacrifice is often worth it.
Rarely, stones of a green color are also found. These are particularly valued by collectors.
Lying in the shadow of Mount Kilimanjaro, the world’s only commercial tanzanite mines have resulted from massive tectonic activity that created one of the most highly mineralized zones in the world — the Mozambique Orogenic Belt.

Tanzania’s gem deposits are a product of this belt, which cuts a 200–300 km-wide north-south swath through the central and eastern part of the country. Running all the way from Mozambique in the south, to the Sudan and Ethiopia in the north, it is home to many of East Africa’s most important colored gemstone finds.
Rocks in this belt underwent several different cycles of tectonism, as well as extensive metamorphism, plutonism, folding and faulting. The metamorphism produced granulite complexes, which, when combined with major crustal movements, formed a witch’s brew of unusual minerals and color varieties. In the granulitic cauldron, pressure and hot fluids cannibalized minerals for their chromophores — vanadium, chromium, manganese — where they were absorbed by existing minerals. At other times, minerals were simply dissolved and built anew. The result is one of the richest gem belts on the planet.

Tanzanite is recovered from pegmatitic veins that have become so stressed they have broken into smaller pieces known as boudins. Gems are found in small pockets within the boudins.
Originally tanzanite could easily be collected on the surface, but this scavenger mining quickly gave way to pits and now tunnels, some of which extend hundreds of meters beneath the surface Working the Blueseam: The Tanzanite Mines of Merelanie
The conquest of the earth, which mostly means the taking it away from those who have a different complexion or slightly flatter noses than ourselves, is not a pretty thing when you look into it too much.
Joseph Conrad, Heart of Darkness
In much of the world, the haves and those not even close toil side-by-side, each with simultaneous desire and disdain for the other. Perhaps nowhere else on the planet are the contrasts as compacted as the few square kilometers that comprise the tanzanite mines of Merelani. This is where First World meets Third, a pressure-cooker that turns brown earth to blue jewels—where envy and avarice squeeze out of the graphite dust that coats all—black, white, and brown—in a sparkling mixture of blood, sweat and indigo tears.

15.42 carats of deep blue wonder. The discovery of gems such as this set the world afire in 1967.
Photo © Wimon Manorotkul/Pala International; specimen courtesy of Robert & Phyllis Hughes
Blue lightning
Ever since Ndugu Jumanne Ngoma stumbled upon shimmering blue crystals in the shadows of Tanzania’s Mount Kilimanjaro, tanzanite has become one of the world’s most sought-after gemstones. No wonder. As anyone who has ever laid eyes on this gem can testify, tanzanite has a take on the blues that can drive even the finest sapphire to kick the nearest dog. And yet, when it was first discovered, Ngoma could hardly give it away:
I found the tanzanite in Merelani, Arusha, in the area called Kiteto at the beginning of January 1967. I was on my way to visit some of my relatives who live in Kiteto, when walking through the bush I saw some crystals of a blue mineral lying on the ground. There were very nice… They were blue, some were transparent… In a few hours I collected about 5kg — they were all very lovely blue crystals.
A friend told me to get on the bus and go to Nairobi… where there was a much bigger gem market than in Arusha. So I borrowed some money for the journey and went to an overseas company who deals in precious stones… and I let them see the 5kg of tanzanite. They didn’t even know what the mineral was. They told me, though, that as soon as they knew, they would let me know. I left them with the 5kg of tanzanite in exchange for a return ticket home, worth $5.… 33 years have gone by and I’m still waiting for their answer! But I kept some samples for myself.
Ndugu Jumanne Ngoma, relating his discovery of tanzanite to author Valerio Zancanella
Following this discovery, tanzanite quickly became one of the world’s most popular gemstones. Some credit is due to Tiffany & Co., who introduced it to market with a lovely name that pays tribute to the beauty of the land of its birth. Tiffany understood that to call this glamorous gem by its mineral name, blue zoisite, would not do it justice.
Today tanzanite is available in a variety of shapes and sizes. Rarely pure blue, tanzanite almost always displays overtones of violet. In smaller sizes, it tends toward lighter shades of lavender and periwinkle, while in sizes above ten carats, tanzanite can show richer, more intense blue colors.
A stunning design from Ginny Dizon, incorporating natural brown and faceted blue tanzanites. A gentle heat treatment turns the brown crystals blue.
Tanzanite Foundation

Tanzanite is trichroic, meaning it shows different colors when viewed in different directions. One direction is blue, another purple, and the other bronze. When found in the ground, the bronze color often dominates. However, with gentle heating (~520°C), one can watch the blue and violet bloom and deepen in the stone. The resulting color is completely stable.
Legend has it that the effect of heat was first discovered when brown zoisite crystals exposed on the surface were caught in a fire set by lightning that swept across the grass-covered Merelani hills. The Masai herders who drive cattle in the area noticed the beautiful blue color and picked the crystals up, becoming the first tanzanite collectors.Owing their color to traces of the element vanadium, cut stones with more blue than violet tend to be more expensive because the crystals generally form with the blue color axis oriented along the width of the crystal instead of the length. That means that if the cutter chooses to maximize the purity of the blue color, the stone cut from the rough will be smaller and thus cost more per carat. The blue color, however, is so beautiful that the sacrifice is often worth it.
Rarely, stones of a green color are also found. These are particularly valued by collectors.
Cauldron of gem creation
Proclus in his book of Sacrifice and Magick, saith, That the antient Priests were wont to mix many things together, because they saw that divers Simples had some property of a God in them, but none of them by it self sufficient to resemble him. Wherfore they did attract the hevenly influences by compounding many things into one, whereby it might resemble that One which is above many.
Lying in the shadow of Mount Kilimanjaro, the world’s only commercial tanzanite mines have resulted from massive tectonic activity that created one of the most highly mineralized zones in the world — the Mozambique Orogenic Belt.
Tanzania’s gem deposits are a product of this belt, which cuts a 200–300 km-wide north-south swath through the central and eastern part of the country. Running all the way from Mozambique in the south, to the Sudan and Ethiopia in the north, it is home to many of East Africa’s most important colored gemstone finds.

Rocks in this belt underwent several different cycles of tectonism, as well as extensive metamorphism, plutonism, folding and faulting. The metamorphism produced granulite complexes, which, when combined with major crustal movements, formed a witch’s brew of unusual minerals and color varieties. In the granulitic cauldron, pressure and hot fluids cannibalized minerals for their chromophores — vanadium, chromium, manganese — where they were absorbed by existing minerals. At other times, minerals were simply dissolved and built anew. The result is one of the richest gem belts on the planet.
Tanzanite is recovered from pegmatitic veins that have become so stressed they have broken into smaller pieces known as boudins. Gems are found in small pockets within the boudins.

Map of Tanzania and southern Kenya, showing the major gem localities. The tanzanite mines of Merelani are located just south of Mt. Kilimanjaro. Click on the map for a larger version. Map © R.W. Hughes
Originally tanzanite could easily be collected on the surface, but this scavenger mining quickly gave way to pits and now tunnels, some of which extend hundreds of meters beneath the surface.
Miners work the face in TanzaniteOne's Block C mine. The extraction process begins with brute force, but ends with the utmost care to avoid damaging the gems. Unlike the other blocks, mining conditions at Block C are excellent and the company has a fine safety record. Photo © TanzaniteOne
TanzaniteOne
I couldn't help asking him once what he meant by coming here at all. 'To make money, of course. What do you think?' he said scornfully.
Joseph Conrad, Heart of Darkness
While Tanzania's tanzanite mines were discovered by a native Tanzanian, the potential wealth quickly attracted outsiders. These included a variety of characters, both Tanzanian and foreign, who pushed the original discoverer out. Soon the Merelani hills were awash with thousands of fortune seekers and chaos ensued. In 1971, the tanzanite mines were nationalized, but production over the next 20 years was erratic, due to haphazard mining and theft. By 1989, an estimated 30,000 artisanal miners were working in the area.
In 1990, the Tanzanian government curbed artisanal mining and demarcated the area into four blocks: A, B, C and D. Block A was awarded to Kilimanjaro Mines Limited, Blocks B and D to small-scale miners and Block C to Graphtan Limited, a graphite mining company. Graphtan ceased mining activities in 1996 and Afgem acquired the mining licence for Block C. In 2000, Afgem completed a feasibility study for the commercial mining of tanzanite and mine development commenced in 2001. In 2004, the TanzaniteOne Group, a publicly-traded company, acquired Afgem's tanzanite business and assets.
Merelani's tanzanite mines lie within a slender strip of ground, just two km deep by eight km wide. This is Tanzania's most important gem mining area, with as many as 70,000 people supported by those mining, cutting and trading tanzanite in Merelani, Arusha and beyond. 5000 to 6000 miners are said to work at Block D alone, which is the area where the deepest tunnels are found, as the deposit trends down from Blocks A through D.
The TanzaniteOne mine is impressive, to say the least. Indeed, the entire operation exudes class, from the mining conditions underground to the promotional efforts of the Tanzanite Foundation, a non-profit dedicated to promoting tanzanite and assisting the people who mine it. Having observed colored gem mining operations around the world, we must say that the rest of the industry has much to learn from their approach. Does this sound like gushing? We hope so, for they have earned it.
And yet TanzaniteOne faces the dilemma that, no matter how much good work they do, no matter how many schools they fund or roads they build, no matter how much they promote tanzanite as a whole, they will always be regarded with suspicion. The locals understand that, like Joseph Conrad's Kurtz in Heart of Darkness, they have come to this land solely to make money. When the profit is gone, they will leave. Native Tanzanians are different. This is their land, their home. Even if the money is gone, they will remain. They have nowhere else to go.
The road to somewhere
Kilimanjaro Airport lies some 50 km from Arusha. A further 16 km along a small dirt road brings you to the world's only significant tanzanite deposit. Whirlwinds swirl lazily on the dusty plain as one heads into the Merelani hills, carrying you straight into the blue heart of tanzanite.
Along the way, a sign reveals: "This road has been proudly built, sponsored and maintained by the Tanzanite Foundation."
As we passed, a local member of our party declared the billboard an insult. "Look at this road," he snorted. "Dirt! With all the money they are making, why isn't it tarmac [paved]?"
Hmmm… We countered that, while it was unpaved, it did happen to be graded and was as good as any unfinished road in the country. Indeed, in the three weeks we had spent traveling around Tanzania, we had seen far worse.
Then a discussion began on the cost of paving roads. We suggested that such pavement was quite expensive, but that if the Tanzanian government felt a paved road in this place was important, they could simply raise the royalties on TanzaniteOne to pay for it. This brought laughs all around; even the original doubting Thomas had to admit that, if the rent were raised, not a single shilling would make its way to Merelani for road improvement.
The conversation was brought to a rapid halt by an incredible thump. We had just turned off the road maintained by the Tanzanite Foundation and were now on the "regular road" to Merelani. These few kilometers were as rough as anything we had suffered in Tanzania.
The blue streets of Merelani
Strength is just an accident arising from the weakness of others.
Joseph Conrad, Heart of Darkness
Driving towards TanzaniteOne's Block C mines, we inquired as to the possibility of visiting Merelani and the other operations; before we could even finish the sentence, a curt "no" was expelled by the company's driver.
Up on the hill, we took up the question with a higher authority, namely TanzaniteOne's Managing Director, Zane Swanepoel. Brows furrowed and, amidst hushed whispers, the possibility was discussed. The question was not so much that of hiding the dark side, but more one of physical safety. Not just ours, but that of the TanzaniteOne staff who might take us into the lion's den. In the end, discretion ruled. We would have to seek an alternative guide to visit Merelani's blue streets and indigo pits.
by Vincent Pardieu and Richard W. Hughes, with Guillaume Soubiraa,
Michael Rogers, Warne and Monte Chitty and Philippe Brunot
Tanzanite was enthusiastically celebrated as "Gemstone of the 20th Century" after its discovery in 1967. It is named after the East African state of Tanzania where its only deposit has been found. The legendary New York jewelers Tiffany & Co were the first to promote tanzanite as a fine gemstone.
Tanzanite is a variety of the zoisite species. In good quality the color is ultramarine to sapphire blue. The most popular color is a saturated blue, which shows a purplish hue shimmering around it.

Tanzanite needs experienced cutters to treat it carefully, as the stone has perfect cleavage in one direction. The stone is cut in all imaginable shapes and forms, from classical round cuts to imaginative designer cuts.
Nearly all tanzanite has been heat treated to produce the striking violet-blue color.

Due to its minor hardness (6.5-7 on Mohs scale) tanzanite is not especially durable. Therefore it should be worn with care.
Tanzanite has become so popular that in October of 2002 the American Gem Trade Association (AGTA) announced that tanzanite had joined zircon and turquoise in the list of birthstones for the month of December.
Tanzanite colors
Buying Tanzanite
Where is Tanzanite found?
Common Tanzanite treatments
World-famous Tanzanite
Tanzanite gemology
Tanzanite legends & lore
Tanzanite colors
In good quality the color is ultramarine to sapphire blue. The most popular color is a saturated blue, which shows a purplish hue shimmering around it.
Buying Tanzanite
Due to its minor hardness (6.5-7 on Mohs scale) tanzanite is not very resistant. Therefore it should be worn with care, and should never be cleaned by ultrasonic methods.
As the stone is found in only one location, it is especially rare.
Color
The most popular color is a saturated blue, which shows a purplish hue shimmering around it.
Lighting
Typical for Tanzanite is the appearance of several colors in one and the same stone (pleochroism), which means, depending on the perspective, the stone appears blue, purple, brown or yellow. In artificial light tanzanite color appears more amethyst blue.
Clarity
Tanzanite is a transparent gem, and eye clean specimens can often be found. Tanzanite cat's eyes are rare.
Cut
Tanzanite needs experienced cutters to treat it carefully, as it has perfect cleavage in one direction. The stone is cut in all imaginable shapes and forms, from classical round cuts to imaginative designer cuts.
Tanzanite location and deposits
The only known deposit of tanzanite is a five square mile hilltop at Merelani Hills near Ausha, ten miles south of the Kilimanjaro International Airport in Tanzania.
Common Tanzanite treatments
Most rough crystals show a large proportion of brownish-yellow tints, which vanish when heated to 752-932 degrees F (400-500 degrees C).
World-famous Tanzanite
Tanzanite gained worldwide fame as a fine and rare gemstone in itself. Tanzanites in especially good qualities and larger sizes are in serious demand and command high prices. It isn't only the spectacular color. Since the stone is found in only one special location in the entire world, it is especially rare.
Tanzanite gemology
Species: Zoisite
Color: Sapphire blue, amethyst, violet
Chemical composition: Ca2Al3(Sio4)3(OH) calcium aluminum silicate
Crystal system: Orthorhombic, multifaceted prisms, mostly striated
Hardness: 6.5-7 (Mohs scale)
Specific gravity: 3.35
Refractive index: 1.691 - 1.700
Birefringence: +0.009
Color of streak: White,
Absorption spectrum: 595, 528, 455
Fluorescence: None
The Tanzanite zodiac, myth & legend
Too new to have written a page for itself in the books of myth, history, wisdom, the zodiac scheme or the relation between planets and mankind, tanzanite left its mark in present time. It has become so popular that in October of 2002 the American Gem Trade Association (AGTA) announced that tanzanite had joined zircon and turquoise in the list of birthstones for the month of December.