"The Necklace" gets its title from the gorgeous piece of diamond jewelry that drives the story's plot. The expensive nature of the necklace is not the only way in which wealth is central to this story. The main character of "The Necklace" is obsessed with wealth. She wants nothing else than to escape from her shabby middle-class life with a shabby middle-class husband and live the glamorous life for which she was born. She's so jealous of her one wealthy friend it hurts. When Mathilde's given the chance to get decked out in diamonds and go to a ritzy party to mingle with all the beautiful people, it seems like her dreams have finally become a reality. Then she loses the borrowed diamond necklace, gets cast into poverty, and learns what it means to truly live without money.
Mathilde's greed is revealed in her inability to be satisfied by anything.
"The Necklace" takes an entirely neutral stance on wealth.