A 7.03 carat fancy vivid blue , internally flawless cushion cut diamond was sold for a record breaking price of US$9,488,754- approximately US$9.5 million (6.2 million pounds or 10.5 million Swiss francs) on the 12th of May 2009 at a Sotheby’s auction at Geneva, Switzerland.
This has set a new world record price for any gemstone sold at an auction, ie US$1,349,752 per carat. The previous record