De Beers | South African company | Britannica
2 #0183;#32;Headquarters are in Johannesburg, Diamonds were first discovered in southern Africa in the mid1860s on the farm of Nicolaas and Diederick de Beer, near what is now the city of Kimberley. Two diamond mines dug on the farm, the Kimberley and the De Beers, were at one time the worlds most productive; they are no longer in operation.