The Big Diamond Robbery (1929) Online
Tom Markham is the foreman of an Arizona dude ranch. He travels to the "big city" for a meeting with the ranch's owner, George Brooks, after which he will accompany Brooks' daughter Ellen back to the ranch. Brooks tells Tom about the Regent diamond, a valuable stone that Brooks has set in a ring for Ellen. Ellen's friend Rodney Stevens hears about it. Stevens, who is actually the boss of a bandit gang, has his men steal the diamond, but Tom manages to get it back. Stevens doesn't give up, though, and hatches a plan that will get him back the diamond and frame Tom for stealing it.
| Cast overview: | |||
 | Tom Mix | - | Tom Markham |
 | Kathryn McGuire | - | Ellen Brooks |
 | Frank Beal | - | George Brooks |
 | Martha Mattox | - | Aunt Effie |
| Ernest Hilliard | - | Rodney Stevens |
 | Barney Furey | - | Barney McGill |
 | Ethan Laidlaw | - | Chick |
| Tony the Horse | - | Tony |