Lucara's Constellation diamond was just sold for $63 million. The diamond was a massive 813 carats and brought in the highest sale price ever for a rough diamond. It was discovered in November 2015 in the Karowe mine in Botswana. (Lucara)
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Lucara had a record-breaking diamond auction, but the second-largest gem diamond ever is still for sale. See photos of the Constellation and Lesedi La Rona.