A model displays the largest vivid green diamond ever during a Sotheby's auction preview on November 11, 2009 in Geneva. The cushion modified brilliant-cut vivid green diamond weighing 2.52 carats is expected to reach CHF 3.3 to 5.45 milllon (US$ 3.1 � 5.1 million) at a "Magnificent Jewels Sale" in Geneva on next November 17, 2009. AFP PHOTO/ FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
LONDON, ENGLAND - OCTOBER 22: A Cushion Modified Brilliant-Cut Vivid Green Diamond is displayed at Sotheby's on October 22, 2009 in London, England. Weighing 2.52 carats and estimated at USD $3.1 million to 5.1 million, the very rare diamond will be sold at the Magnificent Jewels Sale at Sotheby's Geneva on November 17. (Photo by Peter Macdiarmid/Getty Images)
A Sotheby's employee poses with a 'Vivid Green' 2.52 carats Diamond during a press preview at Sotheby's auction house, in London, on October 23, 2009. The diamond is expected to reach between GBP 1.8-3m (dollars 3.1-5.1m or euro 2-3.4m) when it is auctioned at the sale of Magnificent Jewels in Geneva on November 17. AFP PHOTO/Shaun Curry (Photo credit should read SHAUN CURRY/AFP via Getty Images)
Geneva, SWITZERLAND: A heart-shaped blue-green diamond weighing 2.5 carats is displayed, during a Christie's preview 17 May 2006 in Geneva. The rare gem, the first to be sold at auction in 18 years, is expected to sell for between 550,000 and 750,000 Swiss francs (EURO 360,000 to 480.000, USD 465,000 to 620,000) at the Wednesday night auction in Geneva. AFP PHOTO FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
The 5.03 carat Aurora Green diamond (front) -- the worlds largest fancy vivid green diamond in the world, when auctioned is expected to fetch between 16 million USD and 20 million USD -- sits on display during a preview at Christies in Hong Kong on May 4, 2016. / AFP / ISAAC LAWRENCE (Photo credit should read ISAAC LAWRENCE/AFP via Getty Images)
