Stone: Natural Amethyst Quartz Frame Material: 18K Gold Plated Over Solid Genuine .925 Sterling Silver. Shape: Faceted coin both sides Measurement: 20mm with both rings, stone size is 12mm Weight: 1.4 grams per piece. These stones are known as hydrothermal quartz, which contains the same physical, chemical and optical properties of a natural stone. For further information and details regarding this process, see the Beadunion Blog: http://www.beadunion.com/bezel-gemstone-information |