TCW: Approx. 9 ct Total Weight in Grams: 17 grams Measurement: 29mm x 43mm Gemstone: Amethyst Type of Clasp/Fastening: Post with Butterfly These gemstones are all natural, earth mined stones. All are 92.5 Sterling Silver with 14k gold overlay. This adds a beautiful shine to the piece as well as protection from tarnish.