Harry Winston also was reportedly in talks to buy the remaining interest in Diavik from its partner in the venture, Rio Tinto Diamonds.

FORBES: Harry Winston to Purchase Ekati Diamond Mine For $500 Million

And Anglo will have to compete for new mines with other giants, such as BHP Billiton and Rio Tinto, which between them dig 17% of the world's diamonds.

ECONOMIST: Diamonds

Diamonds from the mine likely to come into commercial production in 2016, Rio Tinto said.

FORBES: Connect