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UNITED STATES - SEPTEMBER 09: The Hope Diamond sits on display at the Smithsonian Museum of Natural History in Washington, D.C., U.S., on Wednesday, Sept. 9, 2008. The Smithsonian Institution is the world's largest museum complex and research organization with 19 museums and 9 research centers. (Photo by Dennis Brack/Bloomberg via Getty Images)

UNITED STATES - SEPTEMBER 09:  The Hope Diamond sits on display at the Smithsonian Museum of Natural History in Washington, D.C., U.S., on Wednesday, Sept. 9, 2008. The Smithsonian Institution is the world's largest museum complex and research organization with 19 museums and 9 research centers.  (Photo by Dennis Brack/Bloomberg via Getty Images)

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LONDON, ENGLAND - APRIL 06: The Farnese Blue, one of the most important historic diamonds left in private hands (est. $3.7-5.3 million) goes on view at Sotheby's on April 6, 2018 in London, England. The 6.16 carat pear-shaped blue diamond which witnessed 300 years of European history and appears on the market for the first time, will be auctioned by Sotheby's in Geneva on 15 May 2018. (Photo by Tristan Fewings/Getty Images for Sotheby's)

LONDON, ENGLAND - APRIL 06:  The Farnese Blue, one of the most important historic diamonds left in private hands (est. $3.7-5.3 million) goes on view at Sotheby's  on April 6, 2018 in London, England. The 6.16 carat pear-shaped blue diamond which witnessed 300 years of European history and appears on the market for the first time, will be auctioned by Sotheby's in Geneva on 15 May 2018.  (Photo by Tristan Fewings/Getty Images for Sotheby's)

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LONDON, ENGLAND - NOVEMBER 16: A close up of Kate Middleton's engagement ring as she poses for photographs in the State Apartments with her fiance Prince William of St James Palace on November 16, 2010 in London, England. After much speculation, Clarence House today announced the engagement of Prince William to Kate Middleton. The couple will get married in either the Spring or Summer of next year and continue to live in North Wales while Prince William works as an air sea rescue pilot for the RAF. The couple became engaged during a recent holiday in Kenya having been together for eight years. (Photo by Arthur Edwards - WPA Pool/Getty Images)

LONDON, ENGLAND - NOVEMBER 16:  A close up of Kate Middleton's engagement ring as she poses for photographs in the State Apartments with her fiance Prince William of St James Palace on November 16, 2010 in London, England. After much speculation, Clarence House today announced the engagement of Prince William to Kate Middleton. The couple will get married in either the Spring or Summer of next year and continue to live in North Wales while Prince William works as an air sea rescue pilot for the RAF. The couple became engaged during a recent holiday in Kenya having been together for eight years.  (Photo by Arthur Edwards - WPA Pool/Getty Images)

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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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Tweezers holding diamond, close-up

Tweezers holding diamond, close-up