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$53 million diamond sold; drones fly blood; Chipotle faces ‘grainy’ queso

Number of the day $53 million That’s the price paid for the biggest diamond found in more than a century. Lucara Diamond Corp. said it sold the 1,109-carat Lesedi La Rona diamond (right) to Graff Diamonds. The gem went unsold at a Sotheby’s auction in London last year. Lucara, known for producing some of the world’s biggest and best stones, unearthed the diamond at its Karowe mine in Botswana. The Lesedi La Rona, a little smaller than a tennis ball, is second in size only to the Cullinan, a 3,106-carat gem which was cut to form the Great Star of Africa and the Lesser Star of Africa, which are set in the crown jewels of Britain.

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