London - London-listed Gem Diamonds said it had sold a 198-carat white diamond recovered from its Lesotho mine in August for $10.6m.
2014 has been a bonanza year for diamond miners such as Gem and larger competitor Petra Diamonds, with the discovery and sale of several high-value stones lifting profits and cash flows.
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"This is a good result for Gem Diamonds, but the value comes in slightly below the recent type II 160 carat diamond which the company sold for $11.1m in March," analysts at Numis Securities said in a note.
The diamond was sold at Letseng's September tender, the company, which also mines in Botswana, the company said in a statement on Wednesday.
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At a tender in February, Gem Diamonds sold a 162.02-carat diamond for $11.1m and a 161.31-carat stone for $2.4m. Both diamonds were recovered from Letseng in January.
The Letseng mine, located in the Maluti mountains of Lesotho, is known for its large white diamonds. Since Gem Diamonds acquired a 70% stake in 2006, the mine has unearthed four of the 20 largest white gem-quality diamonds ever recorded.
"Diamonds providing some much needed excitement in the mining industry at the moment, a nice counter to miserable gold and iron ore prices at present," Numis said.
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