The Great Diamond Robbery

A diamond cutter Ambrose C. Park (Red Skelton) is eager to demonstrate his talent to his employer by working on the rare Blue Goddess diamond. It's a delicate task. One mistake and the gem will be worthless. Two mistakes: it'll be worthlesser! But Park confidently takes on the job, accompanied by criminals who have convinced him they're his long-lose family and who secretly aim to steal the diamond after it's cut.