The Day the Earth Stood Still (1951)
The 1951 Twentieth Century Fox film "The Day the Earth Stood Still" has a scene where a
visitor to Washington DC shows a boy some diamonds and tells him that they are used for money
where he comes from.
and Billy Gray as her son Billy.
In one scene Helen's boyfriend finds one of the diamonds and takes it to a jeweler,
leading to all kinds of problems for Helen and the visitor.
2. Visitor showing his "money"
3. Diamonds are a tourist's best friend
4. Visitor exchanges diamonds for paper money, kid examines the goods
5. A problem with using diamonds for money, they're small and easy to lose
Michael Rennie as Klaatu
Patricia Neal as Helen Benson
Hugh Marlowe as Tom Stevens
Sam Jaffe as Professor Jacob Barnhardt
Billy Gray as Bobby Benson
Writers: Edmund H. North, Harry Bates (story)