Yellow Sun-Drop diamond sold for $12.3m at Sotheby's
A rare yellow diamond known as the Sun-Drop has sold at auction in Geneva for just over $12.3m.
Sotheby's auctioneer David Bennett said the sum - paid by an anonymous telephone bidder - set a world record for a yellow diamond.
Discovered in South Africa last year, it was sold by New York-based Cora International.
Imogen Foulkes reports.