Debswana, De Beers’ joint venture with the Botswana government, has discovered a 1,098-carat rough diamond, one of the largest in history.

The company found the “high gem-quality” stone at its Jwaneng mine on June 1, it said on Wednesday. It will work with the government and De Beers to value and sell the diamond, aiming to maximize returns for the people of Botswana.

“This is the largest diamond to be recovered by Debswana in its history of over 50 years in operation,” said managing director Lynette Armstrong, according to reports by Reuters and other news sites.

The stone trails the 3,106-carat Cullinan diamond, recovered in South Africa in 1905, and the 1,109-carat Lesedi La Rona, which Lucara Diamond Corp. unearthed at its Karowe mine in Botswana in 2005. Karowe also produced a 1,758-carat rough in 2019, but the stone was of “near-gem” quality. Previously, the largest gem-quality Jwaneng diamond was a 446-carat specimen from 1993.