It is a natural opal ring. The main stone is 7mm*9mm oval white opal. 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 Opal is the birthstone of October, it will be a great gift for your lover! Customization is always welcome and please feel free to contact with me if you have any design ideas!