BRIEF-Gem Diamonds' Q4 Letseng mine output rises 7 pct from Q3

Jan 28 (Reuters) - Gem Diamonds Ltd GEMD.L :

* Letseng achieved revenue of $75.6 million in Q4 2013

* Average value of $2533 per carat was achieved for the 3 exports in Q4 2013

* 27,227 carats recovered in Q4 2013, up 7% on Q3 2013

* As mining at Letseng moved into satellite pipe, we have seen improvement on quality of diamonds produced

* Firmer trend in rough prices for Letseng's high value diamonds looks set to continue into the beginning of 2014

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