What happens to mathilde life after the replaces the diamond necklace?

After Mathilde replaces the diamond necklace, her life takes a drastic turn. She and her husband take on significant debt to buy a new necklace, leading them to years of hard labor and poverty as they work tirelessly to repay it. The experience transforms Mathilde, stripping her of her previous dreams of luxury and beauty, ultimately leaving her weary and aged. Ironically, she later learns that the original necklace was a fake, highlighting the futility of her sacrifices and the harsh realities of her ambitions.