A 9.75-carat fancy vivid blue diamond from the collection of Mrs. Paul Mellon sold for more than $32.6 million, shattering its high estimate of $15 million at Sotheby’s New York Thursday. The price set a world auction record for any blue diamond; and at more than $3.3 million per carat, it set a world auction record for price-per-carat for any diamond.

The pear-shaped diamond was sought after by seven bidders who competed for 20 minutes for the gem, Sotheby’s said. It ultimately sold to a Hong Kong private collector who named it “The Zoe Diamond.”