Nicky Oppenheimer and Family - $6.7 billion

Nicky Oppenheimer is grandson to Ernest Oppenheimer, the founder of Anglo American. The South-African billionaire businessman is the first generation of family to chair De Beers, the world’s largest diamond company. In 2012, Nicky sold his 40 percent of the company to Anglo American for $5.1 billion in cash. However, Mr. Oppenheimer still owns 1.8 percent stake in Anglo American.