This is an annotated list of important diamond business magnates. It is in alphabetical order based on last name.
Barney Barnato (1851–1897), British Randlord and diamond magnate Alfred Beit (1853–1906), Anglo-German gold and diamond magnate Thomas Cullinan (diamond magnate) (1862–1936), South African diamond magnate. David Harris (South African businessman) (1852–1942), South African soldier, diamond magnate, and legislator John Dale Lace (1859–1937), South African gold and diamond magnate. Lev Avnerovich Leviev (born 1956), Israeli diamond magnate, investor, and philanthropist William McHardy (diamond magnate) (1846–1913), Scottish-South African diamond magnate Cecil Rhodes (1853–1902), British mining magnate and politician Maurice Tempelsman (1929–2025), Belgian-American businessman, a diamond magnate, and merchant Sir Harold Wernher, 3rd Baronet (1893–1973), British military officer and diamond magnate Sir Julius Wernher, 1st Baronet (1850–1912), German-born Randlord, diamond magnate, and art collector