Good Diamonds Are Hard to Find at World's Richest Gem Mine
Examples of high carat diamonds found in the open pits at the Letseng diamond mine, operated by Gem Diamonds Ltd., sit on display in Letseng, Lesotho. (Photographer: Waldo Swiegers/Bloomberg)

Good Diamonds Are Hard to Find at World's Richest Gem Mine

(Bloomberg) -- The Letseng diamond mine in Lesotho is renowned for unearthing some of the world’s most valuable gems, but it didn’t find many last quarter.
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