Gem Diamonds sparkles

Diamond miner Gem Diamonds produced a sparkling set of 2011 results, with underlying profits shooting up on the back of record carat production at its Letšeng mine in Lesotho.

Diamond miner Gem Diamonds produced a sparkling set of 2011 results, with underlying profits shooting up on the back of record carat production at its Leteng mine in Lesotho.

Revenue in 2011 soared to $395.6m from $266.4m, primarily as a result of the sale of rough diamonds recovered at the group's Leteng and Ellendale mines.

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