• 100% Waterproof, Non-Tarnish, Hypoallergenic We use the process of PVD Coating our 18K Gold chains over surgical grade 316L stainless steel for a non-tarnish, hypoallergenic finish that will hold up best to everyday wear and will never turn skin green. PVD coated jewelry is more resistant to corrosion and signs of wear than gold plated and gold filled jewelry, making it ideal for daily wear.