Jack and Susan are from a middle-class family. Susan is yearning to live the high life. She is discontent with her life as her friends have married wealthy gentlemen and are living it up.
Jack got an invitation to a high class affair hosted by his boss and surprises Susan with it.
Susan doesn't have any expensive evening clothes to wear to the event so she doesn't want to attend.
Jack took out a big chunk of their savings and bought Susan a very expensive silk dress. Susan borrowed an expensive diamond necklace from her friend. She was the most beautiful woman at the party.
After the party, Susan realized that she had lost her friend's diamond necklace.
After working for 10 years to pay off debts from replacing the necklace, Susan discovers that the necklace she had lost was made of fake diamonds. She had to replace a necklace made of fake diamonds with real ones.