Aim-listed diamond miner BlueRock Diamonds, which owns and operates the Kareevlei diamond mine, in the Kimberley region of South Africa has sold four larger gem-quality diamonds in the March tender. A 6.6ct diamond sold for $63 000, an 8.7ct diamond for $104 000, a 12.7ct diamond for $128 000 and a 19.3ct diamond for $116 000.