The Big Diamond Robbery (1929)

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.