May Birthstone Ring, 6mm Cobalt Wedding Band, 0.21ctw Emerald 3-Stone Ring, Brushed Finish Black Ion Plated Cobalt Chrome Anniversary Ring Cobalt is the whitest, inexpensive contemporary wedding band material in the market Resembles and has the look and feel of PLATINUM or WHITE GOLD RINGS Stays as white and does not require rhodium plating. Cobalt is not only hypoallergenic, it is bio-compatible. This is a CUSTOM MADE Ring. Please review our policy in the product description.