SOUTH AFRICA · WEALTH

Key Facts

—The milestone: Johann Rupert has become the second African, after Aliko Dangote, to reach $20 billion on the Bloomberg Billionaires Index.

—The engines: A surge in his Swiss luxury group Richemont and his Remgro win for control of Mediclinic’s hospitals lifted the total.

—The caveat: The figure is index-dependent. Bloomberg lists $20 billion; Forbes, valuing his private holdings more conservatively, is closer to $11.5 billion.