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Gem Diamonds Rises After Unearthing 100-Carat Stone in Lesotho

Gem Diamonds Ltd. rose the most in more than nine months in London trading after discovering a 100-carat white diamond at its Letseng mine in Lesotho.

Gem rose as much as 7.7 percent, the steepest intraday gain since Sept. 6, and traded at 121.5 pence at 8:13 a.m. The diamond is the third stone larger than 100 carats found at Letseng since May, Gem said in a statement today.

“Following recent sales, we believe that this stone could fetch offers greater than $5 million,” Numis Securities Ltd. said in a note to investors.

Letseng, once operated by De Beers, was bought by Gem in 2006 for $118.5 million. The mine has produced some of the world’s biggest diamonds including the 603-carat Lesotho Promise, the largest diamond unearthed this century, and a 550-carat stone that was discovered in 2011.

Gem said that its average selling price was $2,087 a carat in June compared with $1,599 a carat in its first three tenders of 2013.

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