17. Robert Mouawad

GLOBAL RANK: 2,141

NET WORTH 2021: $1.4 billion CHANGE: –$100 million

AGE: 76 COUNTRY: Lebanon SECTOR: Service

Robert Mouawad inherited the family’s eponymous high-end jewelry business that his grandfather founded in Beirut in 1890. He turned over management of the business to his sons Fred, Alain and Pascal in 2010. Mouawad boasts one of the world’s most dazzling gem collections, including Dynasty, a 51.12 carat Russian diamond estimated at nearly $10 million. Robert Mouawad also owns extensive real estate and has developed luxury residences on a manmade island in Bahrain.