Quick view Countess Marianna Serinium® Domed 2mm Ladies Wedding Band Stone Finish $595.00 $330.00 Serinium® DurabilitySerinium® tough, hard and scratch-resistant. Serinium® is twice as hard as Cobalt Chrome, 5 times harder than Titanium, 6 times harder than Platinum, 7 times harder... Choose Options Add to Wish list