The Great Jewel Robber

The Great Jewel Robber is a 1950 American drama film directed by Peter Godfrey and written by Borden Chase. The film stars David Brian, Marjorie Reynolds, John Archer, Jacqueline deWit, Perdita Chandler and Stanley Church. The film was released by Warner Bros. on July 15, 1950.
Plot.
Gerard Dennis (David Brian) is a suave, controlling character dependent on filching jewels in ingenious ways from their owners, often women whom he inveigles into his clutches by seducing them, in order to support himself. Relying mostly on conniving and trickery, he is not above also resorting to violence when necessary to enable him to escape apprehension by the law. He pulls off a series of amazingly clever seductions, heists and escapes from the police before one of his conquests, whom he had married, helps the police catch him, and the film ends with his being sentenced to prison for some 25 years, when he will be 55.