The 910-carat Lesotho Legend was sold in a tender in Antwerp, Gem Diamonds said on Tuesday. The company found the stone, which is about the size of two golf balls, at its Letseng mine this year.
While it’s the most Gem has yet received for a diamond, other companies have sold for more. Lucara Diamond got a record $63m for an 813-carat stone last year and $53m for the 1 109-carat diamond it found at the same time, which was the second-biggest in history.
The Letseng mine is famous for the size and quality of the diamonds it produces and has the highest average selling price in the world. Gem sold a 357-carat stone for $19.3m in 2015 and in 2006 found the 603-carat Lesotho Promise.
So far this year, the company has found six diamonds bigger than 100 carats, putting it on track for its best year yet.