What role does the diamond necklece play in the story?

The diamond necklace plays a central symbolic role in the story. It represents appearance versus reality, as well as materialism and pride. The main character borrows the necklace to appear wealthy, but losing it leads to years of hardship. In the end, the revelation that the necklace was fake highlights the irony of her suffering and teaches a powerful lesson about vanity, honesty, and societal pressure.