If you are referring to the plot of "The Necklace" by Guy de Maupassant, the story is about a young woman who is not satisfied with the money her husband earns. One day, they are both invited to a ball and the woman borrows what she thinks is a very valuable necklace from a friend to wear to the ball. However, at some point, she looses the necklace and is afraid to tell her friend she lost it. So her husband borrows a great deal of money and buys a copy of the necklace, which she returns to her friend. After years of hard work trying to pay off the debt for the necklace, she runs into her old friend. Her friend reveals that the necklace she loaned the woman was really made of fake jewels and, therefore, the woman's hard work has been for nothing. More information on the story can be found at the links listed below.