Frame Material: 18K Gold Plated Over Solid Genuine .925 Sterling Silver.
Shape: Faceted pear shape on both sides.
Measurement: 21mm long, stone is 10x14mm.
Weight: 1.5 grams per piece.
These stones are natural stones. Chalcedony and onyx stones are extremely similar to quartz with an opaque look. For further information and details regarding this process, see the Beadunion Blog: http://www.beadunion.com/bezel-gemstone-information