What is the theme of the necklace that concern of the danger of attaching important to wealth?

Mathilde thought she was worthy of great things because she was beautiful and charming. So she borrowed a diamond necklace to look above her station and lost it. She replace the fake necklace (that she believed was real) with a real necklace but it took her and her husband years of hard labor to do so. Had she been honest, she never would have wasted those years.