Amethyst Sterling Silver EarringsA teardrop of violet quartz at the earthe stone that defined February. Amethyst is the violet to purple variety of quartz (SiO), its color driven by iron impurities and natural irradiation within the host rock. The tone deepens where the crystal grew most slowly, giving natural amethyst its characteristic color zoning. Mohs hardness 7. The traditional February birthstone. The name comes from the ancient Greek amethystosnot intoxicatedreflecting the