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Yellow Sun-Drop diamond sold for $12.3m at Sotheby's

15 November 2011 Last updated at 23:05 GMT

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.