Pear-shaped pink diamond sells for $31.5 million at Sotheby's

Pear-shaped pink diamond sells for $31.5 million at Sotheby's: A rare pear-shaped vivid pink diamond fetched 30.8 million Swiss francs ($31.46 million) at auction on Tuesday (May 17), Sotheby's said, but several other large stones failed to reach the reserve prices set by the sellers.