Why plated jewelry tarnishes
The gold itself does not tarnish — pure gold is chemically inert. The problem is everything under it. Plating is measured in microns (thousandths of a millimetre), and even good-quality plating is only a few microns thick. Daily friction against skin, clothing and surfaces abrades that layer, while sweat, moisture and air reach the base metal through microscopic pores and at worn spots. Copper and brass bases oxidise and can migrate to the surface, leaving a dark or greenish film and sometimes marking your skin. Rings and bracelets wear through first because they take the most contact; earrings and pendants last longer.
Vermeil, plated, gold-filled and solid — the difference
The finishes differ mainly in how much gold sits on top and how long it lasts:
- Gold-plated / gold electroplate: roughly 0.5–2.5 microns of gold over base metal. Lifespan from a few months to a couple of years of regular wear.
- Gold vermeil: plating of at least 2.5 microns over sterling silver rather than base metal — longer-lasting, and the substrate is itself a precious metal.
- Gold-filled: a bonded gold layer that must be at least 1/20 (5%) of total weight in the US — dozens of times thicker than plating. Often lasts decades.
- Solid gold (9k–24k): gold all the way through. Does not wear off and does not tarnish; a lower karat can dull slightly from its alloy metals but polishes back.
What speeds up tarnishing
Contact with water, sweat, perfume, hairspray, lotion, chlorine (pools and hot tubs) and household cleaners all accelerate wear and corrosion. So does storing pieces loose in a humid bathroom where they knock together. Taking plated jewelry off before showering, swimming, exercising and cleaning is the single biggest thing you can do to extend its life.
How to slow it down — and replating
Wipe pieces with a soft dry cloth after wearing to remove sweat and oils, store them individually in airtight bags or a lined box away from humidity, and keep them out of water. Once plating has worn through, a jeweller can re-plate most pieces for a modest fee — worthwhile for a sentimental item, rarely worth it on value grounds alone. Mild soap and water is safe for cleaning; ultrasonic cleaners and abrasive polishes strip plating faster.
Is gold-plated jewelry worth anything?
For resale or scrap, almost nothing. The recoverable gold in a plated piece is worth a fraction of a cent to a few cents — refiners generally will not process it, and buyers price plated jewelry as costume, on style and brand rather than metal content. Value lives in solid gold: the jewelry value calculator and scrap gold calculator estimate melt value for solid pieces, and gold-filled has a small but real recoverable amount. If you are not sure whether a piece is solid or plated, the checks on how to tell if gold is real — hallmark, magnet, weight — will usually tell you.