The short answer: a claim needs a build sheet
Nothing in jewelry regulation defines "tarnish-free," and no ISO standard does either, so two factories can print the same words over coatings that behave nothing alike. The claim becomes defensible when four things are written into the quotation: base metal, layer stack, topcoat and a gold-thickness target in microns. A test result behind them makes the phrase answerable.
Why the phrase is everywhere and documented nowhere
Search it in English and page one is retail: Oliver Bonas, Macy's and Ana Luisa all run tarnish-free, waterproof and PVD as headline benefits, and none has to explain the build behind the words. Two bracelets can carry the identical claim and still differ by a seal layer, a copper layer, a clear topcoat and two microns of gold — a gap no photo shows.
The base metal sets the story underneath
- Brass. The default for gold-color fashion jewelry: easy to cast, even under plating, and cheap per unit.
- 925 sterling silver. The premium base, and the one a jeweler can buff back to brightness; plating cannot be repaired that way.
- Stainless steel. It skips the plating question, but holds fine detail less well in casting.
Silver and brass age in completely different ways under the same "gold plated" label. The materials and plating overview compares the three.
The stack, in the order it is built
| Order | Layer | Job |
|---|---|---|
| 1 | Base nickel seal | Sits on the base metal and blocks oxidation from starting underneath |
| 2 | Copper layer | Builds an even surface for the color layer above it |
| 3 | Gold color layer | The visible gold, the layer measured in microns and read by XRF |
| 4 | Protective top coat | Takes the first contact with skin, soap and perfume |
Qiuqiu Atelier's production plating runs all four, in that sequence. Read the table as walls rather than layers: tarnish has to get through every one. A flash of gold laid straight onto brass has none.
What the topcoat is, and what it is not
E-coating is the electrophoretic route: the clear layer forms in a bath, so recesses and edges get covered more evenly than hand-applied lacquer manages. PVD is a different process — vacuum deposition, mainly on steel. Neither is a permanent shield, but the topcoat meets soap, perfume and sweat before they reach the gold.
Microns buy the years; tests prove the layers
Plating thickness drives wear life more than any adjective. The gold plating thickness guide sets out the tiers, and the wear-life map by tier turns them into years.
Three tests cover the three ways a plated piece fails:
- Salt spray — corrosion resistance.
- Artificial sweat — behavior in skin contact.
- EN 12472 — wear and corrosion on coated items.
Ask for the method and the result line, not the word "passed." After production, an XRF gauge reads coating thickness on a finished item without marking it, which is why some brands put a thickness check into pre-shipment QC. The four-layer breakdown covers the structure, and the tarnish prevention guide covers care. REACH, EN 1811, GPSR and CPSIA reports are among the compliance documents available on request, and the compliance testing overview explains what each covers.
What a missing spec costs at the returns desk
The following is an illustrative scenario, not a claim about a named customer or a published Qiuqiu Atelier order.
A buyer's first order of gold-plated bracelets arrived clean. Six weeks into sale, customer photographs came back: dark patches along the clasp, a green trace on the wrist. The supplier blamed skin types. The spec sheet said "gold plated" and nothing more. A second order, from a factory that wrote four lines into its quotation, cost about the same and ended the returns.
Six lines that make the claim defensible
- Named base metal: brass, 925 silver or stainless steel
- The stack, listed in order, with the number of layers
- Topcoat: e-coat, PVD or none
- Gold layer target in microns
- Which tests back it — salt spray, artificial sweat or EN 12472
- Which paperwork ships with the order, and which comes only on request
Any factory can answer six lines; one that cannot is telling you what its quotation hides. The gold-plated jewelry manufacturing page shows how we quote the stack per design, and the reference and quantities can go straight through the Qiuqiu Atelier quote form.
FAQ
Is tarnish-free a real category or purely marketing?
It is marketing language wrapped around a real, measurable behavior: a coating system that keeps the base alloy from reacting up through the finish for a defined period. A supplier who names the stack, the topcoat and the micron target is describing behavior; one who repeats the phrase is describing a listing.
Which base metal should carry a tarnish-resistant line?
All three can, and each changes the story. Brass is cheap and plates evenly; 925 silver can be buffed back rather than replated; stainless steel skips plating but holds fine detail less well. Choose on positioning first, then set the plating specification.
Does the topcoat or the gold thickness matter more?
Thickness is the largest single input to wear life, because the gold color layer is what visibly wears. The topcoat is the multiplier: over a complete stack it absorbs friction and chemistry first. Specify both, since a supplier can be generous with one and silent about the other.
What do salt spray and artificial sweat actually prove?
Salt spray measures corrosion resistance under a corrosive mist, artificial sweat simulates skin chemistry against the piece, and EN 12472 simulates wear plus corrosion on coated items. Together they cover the three ways plating fails: corrosion, contact chemistry, abrasion.
Can I put tarnish-free on my own product page?
Yes, once the specification is in your file: base metal, layer order, topcoat and micron target, with the test result that matches. Write the claim the way the specification reads, and add care instructions covering perfume, showers and swimming. A claim with a build sheet survives a marketplace review; a phrase alone does not.