Gemstone Pendant - Sterling Silver - 14mm Faceted Round Shape - Prehnite Chalcedony (Sold Per 2 Pieces) Quantity: Listing price is for 2 pieces. Stone: Prehnite Chalcedony Frame Material: Solid Genuine .925 Sterling Silver. Shape: Faceted coin shape on both sides. Measurement: 19mm long, stone is 14mm.