It is a natural black spinel ring. The main stone is 7mm*7mm round cut, weight about 1.65 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 More black spinel rings: https://www.etsy.com/shop/godjewelry?ref=seller-platform-mcnav§ion_id=21680005