It is a natural green amethyst. The main stone is 6mm*8mm emerald cut, weight about 1.54 carats. The basic metal is sterling silver and plated with rhodium. To change the metal to a solid gold (white/rose) or platinum is also available, please ask for a quotation if you want. You can also go to my shop Home for more elegant rings: https://www.etsy.com/shop/godjewelry?ref=hdr_shop_menu Customization is always welcome and please feel free to contact with me if you have any design ideas!