Silver tarnishes because it reacts with sulphur in the air and on skin. Rhodium plating, e-coating and anti-tarnish alloys all slow this down in different ways, and how long they work depends mostly on thickness, which should be stated in microns on your order. This guide compares the options, explains the barrier layer under plating, and shows what to specify for pieces that touch skin every day.
Part of our Sterling Silver Jewelry Wholesale Guide
Silver tarnishes. Not because it is low quality, but because it is silver — it reacts with sulphur compounds in ordinary air to form silver sulphide, a dark film on the surface. Every silver jewelry brand is therefore in the business of managing an inevitable chemical reaction, and the treatment you specify determines whether your customer sees a piece that stays bright for three years or one that goes grey in three months.
This guide covers the surface treatments available for sterling silver, what each costs, how long each lasts, and what to write in a purchase specification so you get what you think you are buying. Deechy Jewelry Manufacturing & Design uses standard plating on catalog styles and offers thicker plating to a specified micron thickness as a custom option from 20–30 pieces, so it is worth knowing what each option gives you.
What Tarnish Actually Is
Tarnish is not oxidation in the way rust is. Silver reacts primarily with hydrogen sulphide and other sulphur compounds present in air, in some foods, in wool, in rubber bands, and notably in human sweat — which is why the same piece tarnishes at different rates on different customers.
Two consequences follow. First, tarnish is a surface film, not corrosion of the metal, and polishing genuinely removes it rather than merely hiding it. Second, anything that physically separates the silver from the air slows or stops the process. Every treatment below is a version of that separation.
Rhodium Plating
Rhodium is a platinum-group metal, extremely hard, brilliantly white, and chemically inert. Electroplating a thin layer over sterling silver produces a surface that does not tarnish, resists scratching better than silver, and reads slightly whiter and brighter than polished silver alone.
This is the standard treatment for mid- and upper-tier silver jewelry, and it is what most customers are unknowingly comparing your product against.
Thickness is the whole specification. Rhodium is expensive per gram, so the temptation to plate thinly is constant. Thickness cannot be judged by eye, so specify it in microns in writing on your purchase order. For jewelry in regular contact with skin, roughly 0.1 to 0.25 microns is a working range, with the higher end on rings and bracelets that take the most abrasion.
The base layer matters more than most buyers realise. Rhodium is conventionally applied over a nickel strike, which improves adhesion. That nickel sits invisibly beneath the finish — and emerges as the rhodium wears through, which is exactly when the customer has been wearing the piece long enough for a reaction to develop. If you sell into the EU or UK, or make any hypoallergenic claim, specify a nickel-free barrier layer such as palladium. It costs more and it removes a category of problem entirely.
Rhodium is a wear layer, not a permanent state. On a ring worn daily it may show through in a year or two. This is normal, it is not a defect, and it is worth saying so on your product page rather than leaving the customer to discover it.
E-Coating
Electrophoretic coating deposits a clear polymer lacquer over the entire piece using an electric current. It seals the surface against air completely, including recessed areas that plating reaches poorly, and it costs a fraction of rhodium.
Its advantages are real: complete coverage, very low cost, and it can be applied over plated or unplated silver as a final protective step. Many manufacturers e-coat as standard without mentioning it.
Its limitations are equally real. E-coating is a polymer, and polymers can yellow with UV exposure over time. It can chip on high-wear edges, and a chipped coating tarnishes in a patch, which looks worse than uniform tarnish. It also very slightly softens the surface reflectivity — a difference most customers will not notice but that a jeweller will.
E-coating is the right answer for fashion-tier product, for pieces with deep recesses or complex texture, and as a supplementary layer over rhodium on high-value items.
Anti-Tarnish Alloys
The third approach changes the metal rather than covering it. Sterling silver is 92.5% silver and 7.5% other metals, conventionally copper — and copper contributes materially to tarnishing. Replacing part of that copper with germanium produces an alloy that forms a transparent protective oxide layer and tarnishes far more slowly. Argentium is the best-known example.
These alloys are still legitimately sterling at 92.5% silver, so nothing changes in your marketing claims. They cost more per gram than conventional sterling and are less widely stocked, which affects lead times. For a brand whose entire positioning rests on durability, they are worth investigating; for most ranges, plating is the more economical route to the same customer outcome.
Comparing the Options
| Rhodium plating | E-coating | Anti-tarnish alloy | |
|---|---|---|---|
| Added cost | Moderate to high | Low | Moderate, in the metal |
| Tarnish protection | Excellent while intact | Excellent while intact | Very good, permanent |
| Scratch resistance | Improved | Slightly reduced | Same as sterling |
| Appearance | Brighter, whiter | Very slightly softened | Identical to sterling |
| Typical life | 1–3 years with wear | 1–2 years, chips on edges | Life of the piece |
| Renewable | Yes, re-plating | Not practically | Not needed |
| Nickel risk | Yes, unless specified out | None | None |
What to Write in Your Purchase Order
Four lines prevent most surface-finish disputes.
State plating type and thickness in microns, not just "rhodium plated." State the barrier layer explicitly — nickel-free palladium if you sell into Europe or make hypoallergenic claims. State whether e-coating is applied, because it often is applied by default and you should know what is on your product. And ask for a salt-spray or accelerated tarnish test result on new styles, which is a standard test and tells you in days what would otherwise take a year of customer wear to reveal.
Finally, tell your customers how to care for the product. A polishing cloth in the box and a line about storing pieces in a sealed bag away from humidity costs almost nothing and measurably reduces tarnish complaints — most of which are storage problems rather than product problems.
Compare white and gold finishes across rings and necklaces, such as this rhodium-white zirconia ring. Our guide to gold vermeil vs gold plating covers the gold side, and the glossary defines rhodium and e-coating.
Frequently Asked Questions
Does rhodium plating stop silver from tarnishing?
Yes, while the layer is intact. Rhodium is chemically inert and does not react with sulphur compounds, so a properly plated piece will not tarnish. It is a wear layer, however, and on items worn daily it can wear through within one to three years, at which point the silver beneath is exposed again.
How thick should rhodium plating be on silver jewelry?
Roughly 0.1 to 0.25 microns is a working range for jewelry in regular skin contact, with the higher end for rings and bracelets that take more abrasion. Always specify thickness in microns on the purchase order.
Is there nickel under rhodium plating?
Often, yes. Rhodium is conventionally applied over a nickel strike for adhesion, and that nickel becomes exposed as the rhodium wears. If you sell into the EU or UK or make hypoallergenic claims, specify a nickel-free barrier layer such as palladium instead.
What is e-coating on silver jewelry?
A clear polymer lacquer applied by electric current that seals the entire surface against air, including recessed areas plating reaches poorly. It is inexpensive and effective, but it can yellow under UV over time and chip on high-wear edges.
What rhodium plating does Deechy use?
Catalog styles use standard rhodium plating. Thicker plating to a specified micron thickness is available as a custom option from 20–30 pieces, and REACH testing, which covers nickel release, is available at an extra cost.
Part of our Sterling Silver Jewelry Wholesale Guide
