The Incomparable, at 407.48 carats, is the third largest diamond ever cut, only the Golden Jubilee and Cullinan I are larger. It has been graded by the Gem Trade Laboratory Incorporated as a Shield-Shaped Step Cut, Internally Flawless clarity and Fancy Brownish-Yellow in color.
The DeYoung Red Diamond, weighing 5.03 carats, is the fourth-largest known red diamond. It was bought in a flea market on a hatpin by Sidney deYoung, a prominent Boston estate jewelry merchant (the owner thought it was a garnet). It was donated by him to the Smithsonian Institution National Museum of Natural History.