Graff Pink Diamond. Rivalling the Steinmetz Pink is the Graff Pink, a 24.78-carat emerald-cut diamond once owned by the jeweler Harry Winston. But in 2010, the Fancy Intense Pink gem went up for auction, which caused David Bennett, director of the international jewelry department at Sotheby’s, to gush: “I cannot exaggerate just how rare this stone is. This sale is one of the most exciting of my 35-year career. It is one of the most desirable diamonds ever to come to auction."