Flawless 6.04 carat blue diamond has sold for $7.98 million at a Sotheby's auction in Hong Kong 10/09/2007 | Business
A flawless 6.04 carat blue diamond has sold for $7.98 million at a Sotheby's auction in Hong Kong, making it the world's most expensive precious gemstone per carat.
A spokesman for Sotheby's said... 
|