Choose Options Quick view Bishop of Kilburn Serinium® Rounded Edge 6mm Wedding Band with Double Groove 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: $625.00 $375.00 Choose Options