Diamonds Gleam in a Robot's Eye

A scientist who has no shortage of strange devices accidentally invents a robot that manufactures diamonds. Gavotte, a New York gangster, gets it to give to his girlfriend, Baby, but all they get out of it is ice. And thus follow a series of ridiculous failed exchanges surrounding the doctor and the robot, leading finally to a swap site at an amusement park. Can the robot be restored to its proper function?