The "Blue Moon" diamond is displayed for a photograph at the Cora International LLC office in New York, U.S., on Thursday, Aug. 7, 2014. The 29.62-carat blue rough diamond, recovered from the Cullinan mine in South Africa, was sold sold to Cora International by Petra Diamonds Ltd. for $25,555,555, or $862,780 per carat, according to the mining company. Photographer: Chris Goodney/Bloomberg via Getty Images
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