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The world's richest diamond owners

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8. Fred Mouawad, 44

Net worth: $1.1 billion

Fred Mouawad is one of the three current co-guardians of the Geneva-based family jewelry business Mouawad.

Mouawad is a fourth-generation member of the Lebanese family, which have been involved in the jewelry business since the 1890s. He heads the diamond division of the company and has also founded the Syneria One group of companies, which is involved in industries from jewelry retailing to food outlets.

Mouawad garnered attention last November when he was the last person to bid for a 76.02 carat diamond, which once belonged to Archduke Joseph August of Austria, before it sold for a record $21.48 million in a Christie's auction to an anonymous buyer, Reuters reported.

Photo: www.mouawad.com