18k yellow gold & black ZrTi/NbZr, domed shape! Niobium zirconium damascus ring

New to my Collection seen here as 6mm or 7mm wide, domed shape lined in 18k yellow gold! The exterior is a rare ZrTi forged alloy composition of niobium, zirconium and titanium which hold up well to wear. Please indicate 6 or 7mm during check out.

Materials: niobium, zirconium,  18k yellow gold