According to reports, Gem Diamonds Ltd, which owns and operates the Letseng diamond mine sold a white, D colour 215 carat diamond in Antwerp for $8.3 million to Omega Diamonds. %% The result for the whole of this recent tender where a total of 7,092 carats were sold was $18.4 million. At an average price per carat of $2,598 this is the highest average price per tender for the Letseng mine to date, the company said in a statement. %% The 215 carat diamond was sold in a tender including two other white D colour flawless stones of 66 and 54 carats which sold for $1.2 million and $1.4 million respectively.