Mined in the early 1990s, the De Beers Millennium Star is so flawless and so great in size that diamond experts cannot put a price on it. It took three years for cutters to transform the stone into what is now the world's only internally and externally flawless, pear-shaped diamond weighing 203 carats. It was available for public view at London's Millennium Dome during the year 2000. So enticing was the stone that on 7th November 2000 a robbery attempt was made. Using a bulldozer, nail guns and smoke grenades, the would-be robbers ploughed towards the exhibit, smashing a gate on the way. Once inside, the thieves were foiled by Scotland Yard's Flying Squad, who had been tipped off and were posing as cleaners. The stone remains safely in the hands of De Beers LV.