Grooved Edge, Brushed Finish with 3 lines of Black Inlay. Width of this ring is 7mm and it is a Comfort Fit Ring Cobalt rings are made from a unique alloy blend of Cobalt and additives. The natural bright, white colour never fades or discolours and is often compared to platinum. Cobalt is an incredibly hard metal and provides uncompromising strength. Cobalt is shatterproof, scratch resistant and hypo-allergenic. Cobalt rings can be stretched up to a half size. Available from ring size 6 to 14.