The company sold a total of 63,991 carats, including 47,658 carats at an average cost of $75 per carat totaling $3.5m in October and 16,333 carats at an average cost of $96 per carat totaling $1.6m in November.
A 28% increase in the average carat cost in the November 2012 tender was attributed to higher quality diamonds produced from the K2 unit of the Main Pipe.
Firestone Diamonds CEO Tim Wilkes commented on the sale saying that tenders held in Gaborone and Antwerp were accomplished as expected.
"These type 2A and high colour white stones were recovered from the upper benches of the K2 ore that was mined during the period leading up to the tender.
"Although this rock unit is lower grade (24 carats per hundred tonnes "cpht") than the higher grade K5 section of the mine (45 cpht), it consistently produces higher quality diamonds," Wilkes said.
The company currently produces diamonds from its mining operations located in Lesotho and Botswana.
