Satin Finish Cobalt Band CR8 has combination of satin and shiny finish.The width of this band measures 7 mm. 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 sizes 6 to 14. Rings. Cobalt Rings are supplied in a black ring box with white pad, supplied in a sleeve, labeled with part number and suggested retail price.