Sterling Silver Amethyst Butterfly Pendant, 18":Round and marquise-shaped amethyst stones form bright butterfly wings in this charming sterling silver pendant. The stones are held securely in prong settings and frame a silver centerpiece detailed with polished bead accents. Appointed with a split bale, this pendant slides along an 18-inch sterling silver frozantin chain that fastens in back with a spring ring clasp. Amethyst, the birthstone for February, is a gemstone that has been prized by royalty throughout the ages for its regal purple color.