Sold at auction for $10.9 million in 2011, just a year after it was found in South Africa, the Cora Sun-Drop Diamond is the world’s most expensive vivid fancy yellow diamond.

The gemstone is pear-shaped and 110.3 carats in size. It went under the hammer at Sotheby’s in Geneva to a mystery telephone bidder.

Because the diamond was new to the market and had no previous owners, this is believed to have further enhanced its value.