Choose Options Quick view Lord Roxby Serinium® Domed Wedding Band 4mm Black Ceramic Inlay Satin Finish 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... MSRP: $750.00 $450.00 Choose Options