Mary received a diamond lapel pin from the estate of her maternal grandmother. It was appraised at $7,500. Because it did not fit in with her sports-oriented lifestyle, Mary sold the pin to a jeweler who told her, “The setting is oldfashioned, but the diamond is forever the same. I’ll give you $3,500 cash.” Later Mary wondered whether she received legally sufficient consideration. Did she? Can she rescind the transaction if she can prove that she received much less than the pin was worth?