de beers cullinan blue SOURCE: Sotheby's/De Beers/Diacore

The world's largest blue diamond ever to come to auction has sold for 450,925,000 HKD, or $57.5 million.

Named "The De Beers Cullinan Blue," the massive 15.10-carat step-cut gem sold at Sotheby's in Hong Kong after an eight-minute bidding war among four hopeful buyers, according to Sotheby's. The winning bid, which surpassed its high estimate of $48 million, came from an anonymous buyer by telephone.

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