In November, Sotheby’s sold the Blue Moon, the 12.03 ct. internally flawless vivid blue cushion cut, for $48.5 million, setting a world record for a diamond at auction.
Before that, however, the stone, discovered at the Cullinan mine in South Africa, was a 29.62 ct. piece of rough, which was purchased by Cora International for $25.6 million at a February 2014 tender.
But what happened in between? How is cutting such a rare and valuable stone—one significant enough to be exhibited at the Natural History Museum of Los Angeles County—different from cutting any other stone?
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