Otto Oppenheimer (1882–1948) was a British diamond dealer, who ran the London end of the De Beers company for his brother Sir Ernest Oppenheimer.
[1] He was the son of Eduard Oppenheimer, a cigar merchant, and his wife Nanette "Nanny" Hirschhorn.
[2][3] The Rise and Fall of Diamonds by Edward Jay Epstein.
(1980) The Diamond Invention by Edward Jay Epstein.
(1982) Glitter and Greed by Janine Farrallel Robert West African Diamonds 1919-1983; An economic history by Peter Greenhalgh 1985