100% Waterproof, Non-Tarnish, Hypoallergenic • 18K Gold PVD, 316L Stainless Steel • Comfortable all day wear • Secure lobster clasp closure We use the process of PVD Coating our 18K Gold jewelry over 316L stainless steel for a non-tarnish, hypoallergenic, polished finish that will hold up best to everyday wear and will never turn your customer's skin green.