Rock star diamond mine Letšeng finds 553 carat beauty

London-listed Gem Diamonds announced Wednesday it has found the world’s 15th largest white diamond at its Letšeng Mine in Lesotho, which is fast-becoming the richest source of large diamonds in the world.

The company  said the type II D 553 carat colour diamond diamond is being analyzed in Antwerp at the moment and has not been named.  Without the occasional large diamond find, the Letšeng pipe would probably be a marginal deposit, but the mine, 30% owned by the King of Lesotho, has also yielded the 603 carat Lesotho Promise turned into a $12.4 million necklace (pictured). The 493 carat Letšeng Legacy sold for $10.4 million in 2007 and the 478 carat Light of Letšeng went for $18.4 million in 2008.

The world’s biggest certified diamond is the 3,106-carat Cullinan, found at the mine near Pretoria, South Africa, in 1905. It was cut to form the Great Star of Africa and the Lesser Star of Africa, set in the Crown Jewels of Britain.

Earlier in August Gem Diamonds announced record first half profits as diamonds from Letšeng achieved an average value of $3,052 almost double that of 2010. The mine produced in the six-month period 105 diamonds that were valued at more than $20,000 p/c.

World’s 15th Largest Diamond Found by Gem at Lesotho Mine – Businessweek reports rough diamond prices advanced 49% in the first half, accelerating after two straight years of more than 30% growth as stagnant production failed to meet Asian demand.

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