 | Lucara’s latest find far outweighs the second-largest stone, a 348-carat piece announced just six days ago. The company reported a 255-carat diamond at the same time. At Lucara’s second Exceptional Stone Tender of 2015 last week, the company sold 13 single stones totalling 1,440 carats for a total of $29.7 million, or $20,625 per carat. |  A tender held last July reaped $68.71 million, or $41,028 per carat, for 14 stones of 1,674 carats. |
 | The largest ever gem-quality diamond is the 3,106-carat Cullinan diamond, found in South Africa in 1905. That diamond was cut into several stones, the two largest of which are a part of Britain’s crown jewels.
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