The diamond was unearthed in November in Botswana at a mine owned by Canada’s Lucara Diamond Corporation. It measured 1,109 carats, the second-largest gem-quality rough diamond ever discovered. Its name means “our light” in the Tswana language.
A spokeswoman said bidding reached $61m – below the $70m minimum Sotheby’s had hoped for.
No rough diamond of this size had ever been auctioned, and after Wednesday’s sale it is unclear if one will for a while.
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