One of the most valuable blue diamonds to ever feature at an auction could sell for more than $48 million, according to Sotheby’s. Named “The De Beers Cullinan Blue,” it is the biggest vivid blue ...
Geneva’s November auctions will showcase the 9.51-carat “Mellon Blue” diamond, a Fancy Vivid Blue gem valued at up to $30 million, alongside the Glowing Rose pink diamond and historic jewels once ...
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