The story is about ruining one's life in the course of trying to be something that one is not. "The Necklace" is perhaps de Maupassant's most popular short story.
Basically, a poor woman borrows her rich friend's fancy necklace. She loses it and spends her life working to buy another, only to find that the original was a fake.
It is about a woman that has always wanted to be rich.She borrows the fanciest ecklace she can find for a party and looses it. She has to work hard during decades to replace it by another valuable necklace. Later,they learn the original necklace was a cheap one.
It is about a woman and her husband who are invited to a party. The woman is wearing a friend's fancy necklace, which she loses. It must then be replaced.