A woman called Madame Loisel is unhappy with her living conditions & thinks that she deserves better than what she currently has. Her husband comes home one day and gives her an invitation to a ball.
Madame Loisel buys a fancy dress with the money her husband gave her for the ball. She also borrows a diamond necklace from her friend Madame Forestier.
Madame Loisel goes to the ball and is the most beautiful woman there.
When Madame Loisel leaves the ball, her husband throws her regular clothes over her neck. Embarrassed, she runs off to find a taxi. When she takes off her regular clothes, she finds that the necklace is gone.
The Loisels pay for an imitation necklace to replace Madame Forestier's, which causes them to be in immense debt & poverty for ten whole years.
One day Madame Loisel runs into Madame Forestier. The story ends with Madame Loisel finding out that the original necklace she had borrowed was an imitation itself!