February Birthstone. Amethyst faceted 4mm gemstone. Beautiful grape colouring. Slightly included to eye clean clarity. Origin: Zambia. Treatment: none. Amethyst is the purple variety of crystalline quartz. Hardness: 7 Mohs. Sterling Silver 4mm, 6 prong facet ear studs with scrolls. Stamped 925 on the ear stems and scrolls. Earring pair Approx. weight: 0.61g Caring for your gemstone earrings: Please Don't subject to any hard blows or rough wear. Avoid harsh chemicals, ultrasonic, or Steam cleaning as they may damage the stone. Sudden change in extreme temperature can break Crystals in time. You can cleanse with warm soapy water and a soft brush then towel dry. They should be kept in a padded jewellery box or bag in a cool, dry place to keep them from getting broken.