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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/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/Getty Images)
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AFP FABRICE COFFRINI