The 100-carat Emerald-cut perfect diamond joins five similarly rare stones in auction history. (Photo courtesy Sotheby’s) Today, Sotheby’s announced that a rare Emerald-cut 100.2-carat perfect ...

The name for emerald itself means “the green of growing things ... emeralds accompanied by uncut, old mine cut, rose-cut, and full-cut diamonds; or jewelry featuring ruby and spinel." ...