Madame Loisel desperately wants a better social life in France with her husband Monsieur Loisel in the 1800's. They live in a nice little house with a Breton girl who did their house work.
Monsieur Loisel gets his wife Madame Loisel an invitation to a fancy party in France.
Madame Loisel buys a new dress, because she thinks the ones she has now aren't good enough for the party. As well she borrows a diamond necklace from her friend Madame Forestier to wear to the party.
Madame Loisel is the main attraction at the party, but then when she leaves the party she realizes she had lost the necklace she borrowed from her friend Madame Forestier.
Monsieur Loisel goes out to find the necklace, but can't find it anywhere. He then tells Madame Loisel to write her friend Madame Forestier that she needs the necklace for a longer period of time. Monsieur Loisel then has to use his inheritance and takes out loans to replace the necklace.
Ten years later Monsieur and Madame Loisel are living in an attic, and has finally paid off the necklace. Madame Loisel finally decides to talk to her friend Madame Forestier that she lost her necklace and replaced it with one twice the price. Madame Forestier admits that the necklace Madame Loisel borrowed was fake.