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Sotheby's Most Valuable Blue Diamond to Ever Appear At Auction

The largest and most valuable blue diamond to ever appear at auction, "The De Beers Cullinan Blue", is held by Stephany Martins at Sotheby's on Tuesday, February 15, 2022 in New York City. The diamond will be offered in a single-lot auction at Sotheby's Hong Kong this April and is expected to be sold at in excess of US$48 Million which is the highest estimate ever placed on a blue diamond. Photo by John Angelillo/UPI

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