(CNN) It weighs a hefty 12.03 carats. The color? An exceptionally fancy vivid blue.
On Wednesday, the 'Blue Moon' diamond sold for a whopping $48.4 million, making it the world's most expensive diamond.
According to the auctioneer David Bennett, it is the "highest price per carat" ever obtained for any kind of stone.
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The record sale, which took place at a Sotheby's auction in Geneva, was a headline in itself. But when the successful bidder renamed it, 'Blue Moon of Josephine', tongues were set wagging.