What did Della sell to Madame Sofronie?

DELLa sold her long, beautiful hair to Madame Sofronie for twenty dollars. She made this sacrifice to buy a platinum fob chain for her husband, Jim's, prized possession, his watch. This act of love highlights the theme of selflessness in O. Henry's story, "The Gift of the Magi." Ultimately, both characters make sacrifices that underscore the depth of their love for each other.