A rare pink diamond has sold for HK$453.2 million (US$57.7 million) in Hong Kong, setting a record for price per carat paid at auction for any diamond or gemstone, according to Sotheby’s auction ...

pink diamonds account for half the list. All five of them have been sold within the last 10 years, according to Sotheby’s. The stone itself is 14.83 carats. However, the original stone found in ...