4. Nicky Oppenheimer & family

•  Net Worth: $6.6 B                                                                      
•  Source of Wealth: diamond
•  Citizen: Johannesburg, South Africa
•  Age: 68

Belonging to the country of South Africa, Nicky Oppenheimer is a diamond magnate in Africa. He is of German Jewish descent from his father’s side. He is the Chairman of company named De Beers in which he owns stakes. De Beers is an umbrella company owning several small diamond companies in South Africa which are involved in mining, shaping and promotion of diamonds in the world. Oppenheimer funded the construction of Tswalu Kalahari Reserve which is the largest game reserve in Africa.