What is anti-tarnish coating on silver, and does it last?

ZKZ Editorial TeamMain answer · Product & gemmology desk

"Anti-tarnish coating" is a general label for a thin layer that keeps air and sulfur away from the silver. The two common types are metal plating, usually rhodium, and a clear polymer coating such as lacquer or e-coating. Both slow tarnish while they are intact, both wear, and neither is permanent, so a listing should say which one it is.

The main types

Fact Suppliers' guides describe rhodium as a hard, inert metal layer that wears through with friction, and e-coating as a clear polymer layer that can chip or yellow and leave patchy tarnish where it fails.

Fact The FTC Jewelry Guides say a surface layer of rhodium on a product described as precious metal should be disclosed, and that a product should not be described as plated or coated with silver or other precious metal unless the coating is of reasonable durability on all significant surfaces (16 CFR 23.5 to 23.7).

How long does it last?

Uncertain Published lifespans vary widely. Jewellers and suppliers quote from a few months to a few years for rhodium or lacquer on rings, depending on thickness, the part of the ring and how it is worn. One supplier guide puts clear coatings at roughly 6 to 24 months on daily-worn rings, and others report much shorter lives on high-friction spots. There is no reliable single figure.

Our advice As a rule, rings lose coating fastest on the inside of the band and the high points, where they rub against skin and surfaces. Pendants and earrings, which move less, tend to keep a coating longer.

What a coating cannot do

• It cannot stop wear. Once the layer is gone, the silver tarnishes in the usual way.
• It can look patchy when it wears, with dark spots next to bright areas.
• It does not replace storage care. Keep the piece dry and away from chemicals.
• It should not be called "tarnish-proof". The FTC Guides say terms like "corrosion proof" or "corrosion resistant" should only be used when they are true for the product.

Questions to ask the seller

1. What is the coating: rhodium, lacquer, e-coat or something else?
2. How thick is it, and is it applied to all surfaces?
3. Can it be redone, and how much does it cost?
4. Does the listing say plainly that the base metal is 925 sterling silver?

It depends Which finish suits you depends on your wear pattern and your attitude to maintenance. Some people prefer bare silver that they polish from time to time, so there is no coating to wear off.

Related reading: Does 925 Sterling Silver Tarnish? Causes and Fixes · Rhodium Plating on Silver Jewelry: What It Does and How Long It Lasts

Sources

• 16 CFR 23.5, FTC Jewelry Guides: misrepresentation as to silver content
• 16 CFR 23.7, FTC Jewelry Guides: disclosure of surface-layer application of rhodium
• 16 CFR 23.11, FTC Jewelry Guides: misuse of "corrosion proof", "rust resistant" and similar terms
• Deechy Silver Jewelry, Rhodium plating, e-coating and anti-tarnish treatments for silver (supplier guide)
• My Silver Jewellery, About tarnishing and plating (retailer guide)

Fact = stated by the cited source. Our advice = editorial recommendation. Uncertain / it depends = limits of what can be said in general.