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: 1.3 grams per piece.
These stones are natural stones. For further information and details regarding this process, see the Beadunion Blog: http://www.beadunion.com/bezel-gemstone-information