Ovidious 7.3mm Mens Cobalt Chrome Wedding Ring features highly polished grooves and fine, stone brushed finish. Cobalt Chrome Metal Values: Cobalt Chrome is a very popular, new fine metal for wedding rings. Cobalt looks like shiny platinum, yet has extreme hardness. Your Cobalt Chrome metal will serve you well. It will stay beautiful & won't tarnish. Cobalt Chrome is also a hypo-allergenic metal making it a great alternative metal option for your fine jewelry wedding ring.