Sotheby's staff use their smartphones during the sales of the Blue Moon diamond by the Sotheby's auction house on November 11, 2015 in Geneva. (AFP)
A vivid 12.03-carat diamond dubbed "Blue Moon" was sold in Geneva for a record 43.2 million Swiss francs ($43 million, 40 million euros) on Wednesday, auction house Sotheby's said.
The price was "the highest per carat" ever for this type of precious stone, said David Bennett, head of Sotheby's international jewellery division. The diamond, described as flawless by experts, had an estimated sale price between $35-55 million.