SuperJeweler 6 1/2ct Ametyhst and Tanzanite Oval Shaped Ring in Sterling Silver All diamonds are rare, natural minerals. The semi-faceted diamonds in this item are natural. SuperJeweler's diamonds in our inexpensive jewelry are beautiful and safe to wear. The diamonds in this jewelry item are not of gem quality, contain from 0 to 16 facets. Crafted In Solid Sterling Silver SuperJeweler offers free shipping in the United States, Canada, the United Kingdom, Australia and almost every country. All purchases from SuperJeweler come with The SuperJeweler Lifetime Guarantee. Your SuperJeweler jewelry purchase includes a lifetime guarantee against the loss of side stones or damage to the jewelry's setting or center stone. It also includes a one-year replacement guarantee against the loss of your jewelry's center stone. Amethyst is a member of the quartz family. Amethyst sold by SuperJeweler is natural and not treated.