P.M. BRIEFING : 101-Carat Diamond Up for Sale

The largest internally flawless diamond to be auctioned will be put on sale in Geneva on Nov. 14.

David Bennett, director of Sotheby’s jewelry department, told a news conference today that the 101.84-carat stone could fetch about $13 million.

The pear-shaped stone is 1.43 inches long and was certified by the Gemological Institute of America as D color. In a white diamond, this is the highest possible classification, denoting a total absence of color. “It is an extremely rare feature in a diamond of this size,” Bennett said.

It also has a purity grading known as “internally flawless,” which is important because the presence of inclusions or other natural features within a stone can impair its brilliance.