A wholesale buyer orders 300 sterling silver necklaces finished with silver dip instead of rhodium plating to save the per-piece plating cost. The pieces hit retail looking brilliant. Six weeks later, the same buyer is calling about tarnish patches and micro-roughness. They had assumed silver dip was a finish. It is not. It is a cleaning chemistry that removes tarnish by dissolving a thin layer of the silver itself, and using it as a production finish is a category error.

What each treatment actually is

Rhodium plating is an electrolytic deposit of rhodium, a platinum-group metal, over a strike layer. On 925 sterling we build a 0.5 to 1.0 micron rhodium coat over a nickel or palladium strike. It is hard (Vickers around 800 HV), uniformly white, and gives sterling the mirror-white look that sells next to white gold. Rhodium plating process and renewal cycle runs 12 to 18 months on a piece worn daily before the coat thins enough to show silver through.

Silver dip is a cyanide or thiourea-based chemical bath that dissolves copper sulfide tarnish off the silver surface. It works fast and makes dull silver shine in seconds, but it also dissolves a few microns of the silver underneath, particularly in crevices. Repeated use in production turns a smooth surface into a micro-rough one, and the piece tarnishes faster afterward because the larger surface area oxidizes quicker.

Wear, thickness, and compliance

Plating thickness is measured and quoted. Electroplating thickness and wear runs 0.5 micron on costume pieces and 1.0 micron on our wholesale white sterling line. Thin spots wear first: the high points of rings and the edges of pendants, which is why rhodium plating bath maintenance (pH, temperature, anode condition) decides whether every piece comes out at the same micron.

Compliance matters for EU retail. Nickel release from the strike layer is governed by REACH nickel rules, which is why nickel-free silver alloy for EU REACH orders uses a palladium strike instead of nickel. We test plating baths quarterly against the ECHA REACH nickel release limits and send the test sheet with the batch.

Which one to sell as a finish

Rhodium is the finish. Silver dip is a cleaning step, sold to the end customer as a home care product, not applied at the factory. Buyers who want an unplated silver look can skip rhodium and ship polished sterling with an anti-tarnish lacquer; that is the third honest option. Rhodium versus rhodium-free finishes is a brand choice, not a cost shortcut, and how often rhodium plating renews tells the customer what warranty cycle to expect.

The cost difference is roughly USD 1.5 to 3.0 per piece at wholesale, which is cheap insurance against a six-week tarnish complaint.

How we tell buyers which finish they actually ordered

We ship two sample finishes on every new account: a polished 925 pendant with 1.0 micron rhodium, and the same pendant unplated with a clear lacquer. The buyer holds both under their display light and picks. The rhodium sample reads white and mirror-bright next to white gold; the unplated sample reads warm silver and shows the metal grain. We do not let buyers choose from a swatch book, because swatch color on paper does not predict how the finish looks under retail LED lighting. For re-orders, we tag the SKU with the finish code so the plating line knows whether to run rhodium, lacquer, or bare. Buyers who later want to switch a SKU from rhodium to bare silver send the sample back; we re-polish and re-lacquer, but we cannot strip rhodium and return the piece to bare silver without removing 1.0 micron of metal, which is priced as a refinish. The difference is that rhodium wear shows as silver coming through at the high points, while lacquer wear shows as tarnish breaking through at the edges, and the retailer complaint for each is different.

FAQ: Rhodium vs silver dip on 925

Is silver dip the same as rhodium plating?

No. Silver dip is a chemical cleaner that dissolves tarnish and a thin layer of silver. Rhodium plating is an electrolytic white coating added on top. They are opposite processes.

How long does rhodium last on 925 sterling?

12 to 18 months on daily-wear rings at 0.5 micron; 18 to 24 months at 1.0 micron. Pendants and earrings run longer because they knock against surfaces less.

Does rhodium plating contain nickel?

The strike layer often does. For EU retail we use a palladium strike, which is nickel-free. We test the bath quarterly and send the ECHA-compliant sheet with the batch.

Can I rhodium-plate a blackened silver piece?

Rhodium covers black oxidization, so it kills the antique look. If you want rhodium on high points and black in recesses, we plate first, then re-oxidize and brush back the high points.

Send over your SKU list and target market. Our plating line runs 0.5 and 1.0 micron rhodium with nickel or palladium strike options, and we test baths quarterly for EU REACH compliance. Small-batch OEM custom manufacturing starts at 30 pieces per design; ask for the plating spec sheet before you commit.

Frequently Asked Questions

How do I prevent sterling silver from tarnishing in storage?

Use anti-tarnish bags with a sulfur absorber, keep humidity under 60% and avoid paper wrapping. Rhodium plating adds a further barrier on high-turn SKUs.

Is rhodium plating worth the added cost?

Yes for display and gift lines. It resists tarnish for 12–18 months and keeps shelf pieces bright, which reduces markdowns.

What purity do you supply?

925 sterling silver, stamped and hallmarked. Fine silver (.999) is available for beads and bullion-style pieces.

What is the MOQ and lead time?

50 pieces per design, samples 3–5 days, bulk 15–20 days.