Round and marquise-shaped amethyst stones form bright butterfly wings in these charming sterling silver stud earrings. The stones are held securely in prong settings and frame a silver centerpiece detailed with polished bead accents. Set on posts with friction back closures, these earrings are a sweet accent for everyday wear. Amethyst, the birthstone for February, is a gemstone that has been prized by royalty throughout the ages for its regal purple color.