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A model poses with the "The Apollo Blue" and "The Artemis Pink" diamonds, mounted as earrings, during a press preview by Sotheby's auction house, on May 11, 2017 in Geneva. The two diamonds will be offer individually for a estimate price of CHF 38,125,00050,160,000 (US$38 50 million) for the Apollo Blue and CHF 12,545,00018,060,000 (US $12.5 18 million) for The Artemis Pink during sales on May 16 in Geneva. / AFP PHOTO / Fabrice COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

A model poses with the "The Apollo Blue" and "The Artemis Pink" diamonds, mounted as earrings, during a press preview by Sotheby's auction house, on May 11, 2017 in Geneva. The two diamonds will be offer individually for a estimate price of CHF 38,125,00050,160,000 (US$38 50 million) for the Apollo Blue and CHF 12,545,00018,060,000 (US $12.5 18 million) for The Artemis Pink during sales on May 16 in Geneva. / AFP PHOTO / Fabrice COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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AFP FABRICE COFFRINI

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LONDON, ENGLAND - OCTOBER 13: A fancy vivid blue diamond ring (est. $14-18 million) goes on view at Sotheby's on October 13, 2017 in London, England. The diamond will be offered at Sotheby's Geneva on the 15th November 2017. (Photo by Tristan Fewings/Getty Images for Sotheby's)

LONDON, ENGLAND - OCTOBER 13: A fancy vivid blue diamond ring (est. $14-18 million) goes on view at Sotheby's on October 13, 2017 in London, England. The diamond will be offered at Sotheby's Geneva on the 15th November 2017. (Photo by Tristan Fewings/Getty Images for Sotheby's)
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Getty Images Entertainment Tristan Fewings

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LONDON, ENGLAND - MARCH 08: A Sotheby's employee displays a 5.16 carat pear shaped fancy vivid blue diamond ring, at Sotheby's on March 8, 2010 in London, England. The internally flawless diamond, estimated at 3 - 3.9 million GPB, is the first to come to auction from the De Beers Millennium collection and will be offered for sale at Sotheby's Hong Kong on April 7, 2010. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - MARCH 08: A Sotheby's employee displays a 5.16 carat pear shaped fancy vivid blue diamond ring, at Sotheby's on March 8, 2010 in London, England. The internally flawless diamond, estimated at 3 - 3.9 million GPB, is the first to come to auction from the De Beers Millennium collection and will be offered for sale at Sotheby's Hong Kong on April 7, 2010. (Photo by Peter Macdiarmid/Getty Images)
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Getty Images News Peter Macdiarmid

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A model shows a blue diamond from the Cullinan mine weighing 7.03 carats that will be auctioned in Geneva with a pre-sale esimate of 5.8-8.5 million USD, on display at a preview of Sotheby's Spring Sales in Hong Kong on April 3, 2009. The auction house will offer 1,700 lots in excess of 76.9 million USD from April 4-8, 2009. AFP PHOTO/MIKE CLARKE (Photo credit should read MIKE CLARKE/AFP via Getty Images)

A model shows a blue diamond from the Cullinan mine weighing 7.03 carats that will be auctioned in Geneva with a pre-sale esimate of 5.8-8.5 million USD, on display at a preview of Sotheby's Spring Sales in Hong Kong on April 3, 2009. The auction house will offer 1,700 lots in excess of 76.9 million USD from April 4-8, 2009. AFP PHOTO/MIKE CLARKE (Photo credit should read MIKE CLARKE/AFP via Getty Images)
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AFP MIKE CLARKE

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A woman holds up the 'Oppenheimer Blue,' a rare fancy vivid blue diamond weighing 14.62 carat during a press preview by Christies's auction house on May 12, 2016 in Geneva. The Blue Oppenheimer will be auctioned in Geneva on May 18 with a pre-sale estimate of $38-45 million and could become the most expensive cut diamond in the world, according to the house Christies. / AFP / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

A woman holds up the 'Oppenheimer Blue,' a rare fancy vivid blue diamond weighing 14.62 carat during a press preview by Christies's auction house on May 12, 2016 in Geneva. The Blue Oppenheimer will be auctioned in Geneva on May 18 with a pre-sale estimate of $38-45 million and could become the most expensive cut diamond in the world, according to the house Christies. / AFP / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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AFP FABRICE COFFRINI