Stone: Prehnite Chalcedony Frame Material: 18K Gold Plated Over Solid Genuine .925 Sterling Silver. Shape: Faceted coin on both sides Measurement: 20mm with both rings, stone 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. Chalcedony stones are extremely similar to quartz with an opaque look. For further information and details regarding this process, see the AZ Findings Blog: http://www.azfindings.com/blog.
