Gorgeous Tungsten Carbide low dome band ring in polished piano black finish with iridescent man-made Hawaii blue opal between Koa inlays. Comfort fit band - slightly domed inner band. Natural tungsten carbide is bright silver. The black and gold in this ring are created via an advanced ion plating process. Made of superior quality tungsten carbide. If you are unsure of your ring size, we recommend going to at least two local jewelry shops to have your finger measured. Please specify you are looking to purchase a "comfort fit" ring. If going to a jewelry shop is difficult, please use a ring sizing guide available all over the internet including the famous jewelry brands. There are also many YouTube videos that show the proper way to measure a finger. As always, thank you for looking at our listing.