The rare white diamonds will be sold in Hong Kong

A 72.22 carat D-color pear-shaped flawless diamond is displayed at Sotheby’s auction house in London, on March 7, 2008. (BEN STANSALL, AFP/Getty Images / March 10, 2008) A 72.22-carat diamond, so large it could fill a tablespoon, is expected to bring up to $13 million when it goes on the auction block next month. Cut from an original rough diamond, the D-color, flawless gem is prized for its