While in London trying to nab several fugitives who stole a million dollars from a U.S. Treasury vault, American federal agent Dennison (Dennis O'Keefe) assists Scotland Yard Insp. McClaren (Philip Friend) in his search for a missing atomic scientist (Paul Hardtmuth). The detective duo discovers that the key to solving both cases may rest with the scientist's daughter (Margaret Sheridan) and her fascinating diamond.
You can now watch The Diamond Wizard online on the following streaming providers in the United States.
| Directing | Dennis O'Keefe | Director |
| Directing | Montgomery Tully | Director |
| Writing | John C. Higgins | Writer |
| Editing | Helga Cranston | Editor |
| Writing | Maurice Procter | Book |
| Production | Steven Pallos | Producer |
| Sound | Matyas Seiber | Music |
| Art | Denis Wreford | Art Direction |
| Sound | Matyas Seiber | Conductor |
| Production | Charles Leeds | Production Manager |
| Directing | Jim O'Connolly | Assistant Director |
| Camera | Arthur Graham | Camera Operator |
| Sound | W. H. Lindop | Sound Recordist |
| Costume & Make-Up | Charles Nash | Makeup Artist |
| Directing | Adele Reynolds | Continuity |
| Camera | Gordon Lang | Director of Photography |
