552-carat diamond unearthed at Diavik

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Dominion Diamond Mines announced it has recovered the largest known gem-quality diamond ever found in North America. The 552.74-carat diamond was unearthed at Diavik Diamond Mine in October, and broke the previous record of 187.7-carat Diavik Foxfire diamond, which was recovered at the same mine in 2015. The U.K.-based Rio Tinto mining group owns a...