London--A 5.30-carat fancy deep-blue diamond set a world auction record for price per carat when it sold for approximately $7.3 million, or $1.8 million per carat, at Bonhams in London on April 24.
Graff Diamonds was the buyer of the cushion-cut diamond, set with brilliant-cut, baguette-cut and pavé diamonds in a “Trombino” ring with crafted by Bulgari. The ring was made circa 1965 and soared past its pre-sale high estimate of $1.8 million.
