Debswana Diamond, a joint venture between De Beers and the government of Botswana, has found a 1,098-carat stone, one of only four rocks over 1,000 carats ever unearthed, and the biggest by the company since it began operations five decades ago.

The yet to be named massive stone was picked on June 1 at Jwaneng, the world’s richest diamond mine by value, which is undergoing a $2 billion expansion.

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