The Big Hole, part of Kimberley diamond mine which yielded 2722 kg of diamonds, Northern Cape, South Africa, Africa

The Big Hole, part of Kimberley diamond mine which yielded 2722 kg of diamonds, Northern Cape, South Africa, Africa

Diamond Mine in extreme north-west, located on the southern bank of the Orange River mouth, Alexander Bay, Northern Cape, South Africa, Africa

Diamond Mine in extreme north-west, located on the southern bank of the Orange River mouth, Alexander Bay, Northern Cape, South Africa, Africa

Aerial view of the Argyle Diamond mine, Kimberley, Western Australia, Australia, Pacific

Coster Diamonds, Amsterdam, The Netherlands (Holland), Europe

Aerial view of the Argyle Diamond mine, Kimberley, Western Australia, Australia, Pacific

Coster Diamonds, Amsterdam, The Netherlands (Holland), Europe

Aerial view of the Argyle Diamond mine, Kimberley, Western Australia, Australia, Pacific

Kimberlite pipe excavated by hand mining for diamonds between 1870 and 1914, now flooded, Big Hole at Kimberley, South Africa, Africa

Diamond mine equipment, Kimberley, South Africa, Africa

Uncut diamonds in the sorting room at De Beers' Diamond Trading Company in Harry Oppenheimer House in Kimberley South Africa.

An uncut diamond being examined during sorting at De Beers' Harry Oppenheimer House building in Kimberley South Africa.

Harry Oppenheimer House in Kimberley South Africa. It the headquarters of the Diamond Trading Company, a part of the De Beers group. Every diamond mined in South Africa passes through this building for sorting and valuation before being sent to London.

An uncut diamond being examined during sorting at De Beers' Harry Oppenheimer House building in Kimberley South Africa.

Uncut diamonds being sorted at the Diamond Trading Company's Harry Oppenheimer House in Kimberley South Africa. It is part of the De Beers company.

Re-created diamond mining tunnels at the Kimberley Open Mine Museum in Kimberley in South Africa's North-West Province.

The De Beers diamond mine in Kimberley South Africa being filled with re-processed mine dump tailings from the De Beers combined treatment plant (CTP).

The Combined Treatment Plant (CTP) run by the De Beers company to re-process diamond mine tailings in Kimberley South Africa. It was opened on 2 August 2004.

The Big Hole in Kimberley in South Africa's North-West Province. Also known as the KImberley mine, it was created during the diamond rush of the mid-nineteenth century.

An uncut diamond being examined during sorting at De Beers' Harry Oppenheimer House building in Kimberley South Africa.

An uncut diamond being examined during sorting at De Beers' Harry Oppenheimer House building in Kimberley South Africa.

The Big Hole in Kimberley in South Africa's North-West Province. Also known as the KImberley mine, it was created during the diamond rush of the mid-nineteenth century.

The De Beers diamond mine in Kimberley South Africa being filled with re-processed mine dump tailings from the De Beers combined treatment plant (CTP).

The De Beers diamond mine in Kimberley South Africa being filled with re-processed mine dump tailings from the De Beers combined treatment plant (CTP).

Extension of the German Mining Museum, Black Diamond, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe

Extension of the German Mining Museum, Black Diamond, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe

Extension of the German Mining Museum, Black Diamond, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe

Argyle diamond mine, aerial view, Kimberley, Western Australia, WA, Australia

Extension of the German Mining Museum, Black Diamond, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe

Extension of the German Mining Museum, Black Diamond, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe

Extension of the German Mining Museum, Black Diamond, Bochum, Ruhr area, North Rhine-Westphalia, Germany, Europe