GOLDEN JUBILEE Originally called the "Unnamed Brown" diamond, this 755.50 carat yellow-brown diamond was found in 1986 in South Africa. It is now the largest cut diamond in the world, weighing 545.67 carats. The stone was designed by Gabi Tolkowsky, who also designed the 273.85 carat Centenary Diamond. The Unnamed Brown was presented to the King of Thailand by a group of Thai businessmen in 1997 to mark the 50th anniversary of his coronation. The diamond was appropriately renamed the Golden Jubilee, and is now on display at the Royal Museum in Bangkok.