The Empire of Diamonds (1920)

Directed by Léonce Perret

Shot on location in Paris, Monte Carlo and the Riviera with both American and French actors. When Matthew Versigny discovers that the jewels his diamond company has been buying are fake, he travels to Europe to track down the counterfeiter. With him are his sister, Marguerite and her sweetheart, Paul Bernac, who is an agent in the French Secret Service.