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A rare colored dimond ring, set with a modified octagonal-shaped fancy purplish red diamond weighing 2.36 carats, the largest red diamond to appear for sale, is seen during a press preview 06 November 2007 in Geneva ahead of a Christie's jewellery auction. The ring is estimated to fetch 900,000 to 1'100'000 euros (1'200'000 to 1'500'000 US dollars) during the traditionnal autumn sales next week in Geneva. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

A rare colored dimond ring, set with a modified octagonal-shaped fancy purplish red diamond weighing 2.36 carats, the largest red diamond to appear for sale, is seen during a press preview 06 November 2007 in Geneva ahead of a Christie's jewellery auction. The ring is estimated to fetch 900,000 to 1'100'000 euros (1'200'000 to 1'500'000 US dollars) during the traditionnal autumn sales next week in Geneva. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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A model poses with a 59.60-carat oval mixed-cut pink diamond, known as 'The Pink Star', during a Sotheby's media preview in Hong Kong on March29, 2017, to promote its auction on April 4. A plum-sized pink diamond is expected to break the world record for a gemstone early next month when it goes under the hammer in Hong Kong, Sotheby's auction house. / AFP PHOTO / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP via Getty Images)

A model poses with a 59.60-carat oval mixed-cut pink diamond, known as 'The Pink Star', during a Sotheby's media preview in Hong Kong on March29, 2017, to promote its auction on April 4. A plum-sized pink diamond is expected to break the world record for a gemstone early next month when it goes under the hammer in Hong Kong, Sotheby's auction house. / AFP PHOTO / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP via Getty Images)
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This photo taken on on October 30, 2015 in Geneva shows a 16.08-carat pink diamond on display during a press preview by the auction house Christie's. The large cushion shaped pink diamond set in a ring is expected to fetch between 23 - 28 million USD in the forthcoming 'Magnificent Jewels' auction on November 10, 2015 in Geneva. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

This photo taken on on October 30, 2015 in Geneva shows a 16.08-carat pink diamond on display during a press preview by the auction house Christie's. The large cushion shaped pink diamond set in a ring is expected to fetch between 23 - 28 million USD in the forthcoming 'Magnificent Jewels' auction on November 10, 2015 in Geneva. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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A model shows the 'Unique Pink' a rare and exceptional Fancy Vivid Pink diamond weighing 15.38 carats during a press preview by Sotheby's auction house on May 9, 2016 in Geneva. The Unique Pink will be offered at a 'Magnificent Jewels and Noble Jewels' auction in Geneva on May 17 with a pre-sale estimate of $28-38 million (CHF 27.2m 36.9m). / AFP / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

A model shows the 'Unique Pink' a rare and exceptional Fancy Vivid Pink diamond weighing 15.38 carats during a press preview by Sotheby's auction house on May 9, 2016 in Geneva. The Unique Pink will be offered at a 'Magnificent Jewels and Noble Jewels' auction in Geneva on May 17 with a pre-sale estimate of $28-38 million (CHF 27.2m 36.9m). / AFP / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)
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The Pink Legacy, a 18.96 carat fancy vivid pink diamond once owned by Oppenheimer family is displayed on November 8, 2018 during a press preview ahead of sales by Christie's auction house in Geneva. - The auction will take place in Geneva on November 13, 2018. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)

The Pink Legacy, a 18.96 carat fancy vivid pink diamond once owned by Oppenheimer family is displayed on November 8, 2018 during a press preview ahead of sales by Christie's auction house in Geneva. - The auction will take place in Geneva on November 13, 2018. (Photo by Fabrice COFFRINI / AFP) (Photo credit should read FABRICE COFFRINI/AFP via Getty Images)
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AFP FABRICE COFFRINI