Canadian miner finds the second-biggest diamond in history — but it’s actually not that great – by Thomas Biesheuvel (Financial Post/Bloomberg News – April 25, 2019)

A giant 1,758-carat diamond, the second-biggest ever discovered, has been found in Botswana. But unlike its rivals, it won’t fetch a record-breaking price.

Lucara Diamond Corp. said it unearthed the stone — roughly the size of a tennis ball — at its Karowe project in Botswana, a mine renowned for its huge gems including the previous holder of the No. 2 position. Still, the company said the diamond is a near gem of variable quality, meaning it won’t yield incredibly valuable polished diamonds on par with earlier finds.

Lucara’s Karowe mine is becoming famous for giant stones. In 2015, Lucara found the 1,109-carat Lesedi La Rona, which at the time was the second-largest ever and eventually sold for US$53 million.

The mine has also yielded a 813-carat stone that fetched a record US$63 million. Those two gems were both much more valuable Type-IIa stones.

Still, the latest find shows that Karowe’s plant can process and detect huge gems without breaking them, a consistent headache when trying to separate brittle stones from hundreds of tons of waste rock.

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