This diamond was sold to an unidentified buyer for US$4.25 million at a Sotheby's
auction in Geneva, Switzerland. The rock, weighing 103.83 carats, is cut in the
classic cushion-shape and is the largest D colour internally flawless diamond.
Diamonds are graded on a D-to-Z colour scale developed by the Gemological
Institute of America, with D being the most valuable. -- EPA