Nicholas F. Oppenheimer is a South African billionaire businessman. He was formerly the chairman of De Beers diamond mining company and of its subsidiary, the Diamond Trading Company, and former deputy chairman of Anglo American. He is the third richest man in Africa.

The De Beers Group is a South African- British corporation that specializes in diamond mining, diamond exploitation, diamond retail, diamond inscription and grading services, diamond trading and industrial diamond manufacturing sectors. The company is active in open-pit, underground, large-scale alluvial and coastal mining. It operates in 35 countries with mining taking place in Botswana, Namibia, South Africa, and Canada. It also has an artisanal mining business, Gemfair, which operates in Sierra Leone.