They use IP Plating which stands for Ion plating.
Luv Aj Bardot Stud Charm Necklace Gold.Necklace is 16” with 2” extender chainNecklace is 100% nickel-free and cadmium-free.1 micron of 18K Gold or Silver, plus e-coating which qualifies it to pass waterproof tests.All of Luv Aj's jewelry is considered waterproof and tarnish-resistant! This is a Physical vapor deposition (PVD) process and the jewelry is plated with at least 0.