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A model holds "The Sun-Drop Diamond" during a press preview of Sotheby's auction on November 9, 2011 in Geneva. One of the world's largest diamonds, a pear-shaped 110.3-carat yellow rock, will go under the hammer in Geneva on November 15, 2011 expecting to fetch about $15 million. The Sun-Drop diamond, discovered in South Africa last year, is billed by Sotheby's as the "world's largest known pear-shaped fancy vivid yellow diamond". AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

A model holds "The Sun-Drop Diamond" during a press preview of Sotheby's auction on November 9, 2011 in Geneva. One of the world's largest diamonds, a pear-shaped 110.3-carat yellow rock, will go under the hammer in Geneva on November 15, 2011 expecting to fetch about $15 million. The Sun-Drop diamond, discovered in South Africa last year, is billed by Sotheby's as the "world's largest known pear-shaped fancy vivid yellow diamond". AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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Geneva, SWITZERLAND: Above a painting of "La Paiva", a model holds the Donnersmarck Diamonds a cushion-shaped diamond weighing 102.54 carats (L) and a pear-shaped diamond weighting 82.48 carats at a preview 08 May 2007 in Geneva. Each exceptional yellow stones which come from the family of Count Guido Henckel von Donnermarck and were worn by "La Paiva" a celebrated courtesan in 19th century in Paris are expected to fetch 1.8 to 2.4 million Swiss Francs (USD 1.5 to 2 Million) in Sotheby's auction on 17 May. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

Geneva, SWITZERLAND: Above a painting of "La Paiva", a model holds the Donnersmarck Diamonds a cushion-shaped diamond weighing 102.54 carats (L) and a pear-shaped diamond weighting 82.48 carats at a preview 08 May 2007 in Geneva. Each exceptional yellow stones which come from the family of Count Guido Henckel von Donnermarck and were worn by "La Paiva" a celebrated courtesan in 19th century in Paris are expected to fetch 1.8 to 2.4 million Swiss Francs (USD 1.5 to 2 Million) in Sotheby's auction on 17 May. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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Patti Wong, Chairman of Sotheby's Asia wears a 80.69-carat Cushion-shaped Fancy Intense Yellow Diamond Ring in Hong Kong on November 24, 2011. The diamond ring, which is valued at 3.5 million USD is a unique retail offering by Sotheby's Diamonds. AFP PHOTO / AARON TAM (Photo credit should read aaron tam/AFP via Getty Images)

Patti Wong, Chairman of Sotheby's Asia wears a 80.69-carat Cushion-shaped Fancy Intense Yellow Diamond Ring in Hong Kong on November 24, 2011. The diamond ring, which is valued at 3.5 million USD is a unique retail offering by Sotheby's Diamonds. AFP PHOTO / AARON TAM (Photo credit should read aaron tam/AFP via Getty Images)
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A model displays a yellow cut-cornered, rectangular modified brilliant-cut diamond mounted on a gold ring, weighing 74.80 carats, during a Sotheby's auction preview on November 11, 2009 in Geneva. The yellow diamond is expected to fetch 1.66 to 2.32 million euros (2.5 to 3.5 million US dollars) at the Magnificent Jewels Sale in Geneva on November 17. AFP PHOTO/ FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

A model displays a yellow cut-cornered, rectangular modified brilliant-cut diamond mounted on a gold ring, weighing 74.80 carats, during a Sotheby's auction preview on November 11, 2009 in Geneva. The yellow diamond is expected to fetch 1.66 to 2.32 million euros (2.5 to 3.5 million US dollars) at the Magnificent Jewels Sale in Geneva on November 17. AFP PHOTO/ FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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A model shows "the Orange" a 14.82-carat pear-shaped, vivid orange diamond during a press preview on October 31, 2013 in Geneva. The largest known orange diamond in the world will be auctioned by Christie's in the Swiss city of Geneva on November 2013, is expected to fetch between between 12,5 and 15 million euros (17 and 20 million US Dollars). AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

A model shows "the Orange" a 14.82-carat pear-shaped, vivid orange diamond during a press preview on October 31, 2013 in Geneva. The largest known orange diamond in the world will be auctioned by Christie's in the Swiss city of Geneva on November 2013, is expected to fetch between between 12,5 and 15 million euros (17 and 20 million US Dollars). AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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