The Incomparable Diamond is the largest flawless diamond in the world. The original rough diamond was 890 carats and was cut to a 407.48 carat polished diamond by world famous master diamond cutter, Hy Kessler.

Below is information provided by Christie’s New York, for their October 19th, 1988 auction of the Incomparable diamond. (download the entire Christie’s New York Incomparable Auction Guide)