The company had sold the diamonds at Petra’s December tender for $8.52m and $3.78m respectively.
On 28 January 2014, the company will report trading update for the six months ended 31 December 2013 (H1 FY 2014), which will provide detailed production and sales analysis.
Petra Diamonds chief executive officer Johan Dippenaar commented, "These solid prices achieved for the two special Cullinan stones as well as for the balance of Petra’s recent tender are very encouraging and reaffirm Petra’s view that firmer market conditions will continue into H2 FY 2014."
Petra Diamonds supplies rough diamonds to the international market.
