Most of us own a small drawer of jewellery that promised more than it delivered: chains gone dull, rings that left a green shadow on a finger, earrings that darkened at the post. Tarnish tends to be spoken about as bad luck or poor care. In truth it is chemistry, and once you understand which side of the chemistry a piece sits on, it becomes easy to avoid. This is an honest guide to why jewellery tarnishes and what genuinely stops it.
Why does jewellery tarnish?
Tarnish is a surface reaction between metal and the world around it. Oxygen, sulphur compounds in the air, sweat, perfume and the natural oils on your skin all take part. Copper and zinc, the metals behind most inexpensive jewellery, are especially reactive. When they meet moisture they oxidise, and the result is the familiar darkening, dulling or greenish tint.
How quickly this happens depends almost entirely on what a piece is made of, which is why two necklaces worn in exactly the same way can age so differently.
The problem with cheap alloys
Most fast-fashion jewellery is brass or zinc alloy with a whisper of gold electroplated over the top, often well under a micron of it. That layer is not armour; it is decoration. Everyday wear rubs through it at the pressure points, the clasp, the back of a ring, the curve of a hoop, and the reactive metal beneath starts oxidising the moment it meets air and skin.
This is why the green mark appears, and why no amount of careful polishing brings such pieces back for long. The tarnish is not a stain sitting on the surface. It is the surface.
Sterling silver: tarnish you can live with
Sterling silver is 92.5 per cent silver, alloyed with a little copper for strength. It does tarnish, gradually darkening as it reacts with sulphur in the air. The difference is that silver tarnish sits on the surface and polishes away completely, revealing bright metal underneath. A sterling silver piece can be worn, dulled and revived for decades, which is a very different proposition from plated alloy.
Regular wear actually helps. The gentle friction of daily life keeps tarnish from settling in, which is why a much-loved silver chain often looks better than one kept untouched in a box.
Why stainless steel resists tarnish
Stainless steel contains chromium, which reacts with oxygen to form an invisible, self-repairing layer across the surface. That layer is the whole trick. It seals the metal away from the air, so the reactions that cause tarnish never get started, and if the surface is scratched, the layer quietly re-forms on its own.
Gold-coloured stainless steel finished with PVD, short for physical vapour deposition, takes this further. The colour is bonded into the surface in a vacuum chamber rather than dipped on, so there is no thin skin to wear through and no reactive metal waiting underneath. If you want jewellery that is genuinely tarnish-resistant with no upkeep at all, this is the combination to look for.
Storage habits that actually help
- Keep jewellery somewhere dry. The bathroom shelf is the worst spot in the house, because humidity is tarnish's favourite condition.
- Store pieces separately, in soft pouches or a lined box, so they cannot rub or scratch one another.
- Fasten clasps before chains go away. It prevents tangles and stops fine links folding back on themselves.
- Add an anti-tarnish strip to the box if you live somewhere damp. They cost pennies and work quietly.
- Give silver a few seconds with a soft cloth after wearing, before it goes back in the box.
What to avoid
- Spraying perfume or hairspray directly onto jewellery. Let them dry first; jewellery goes on last and comes off first.
- Swimming pools and hot tubs while wearing silver. Chlorine accelerates tarnish dramatically.
- Toothpaste, bicarbonate of soda and other abrasive cleaners. They scratch more than they clean, especially on plated surfaces.
- Leaving pieces in a gym bag with damp kit, which amounts to a small humid greenhouse.
The honest answer
You cannot stop chemistry, but you can choose your side of it. If you want pieces that ask nothing of you, choose stainless steel, and look for a PVD finish on gold-coloured pieces; that is where the tarnish-resistant label is actually earned. If you love sterling silver, accept a little gentle upkeep as part of the pleasure of owning it. What is worth avoiding is the in-between: thinly plated alloy that no storage habit in the world can save. Buy fewer pieces on the right side of the chemistry and the drawer of disappointments stops growing.
Rockbourne Jewellery makes waterproof, tarnish-resistant everyday jewellery in 18k gold-plated stainless steel, dispatched from the edge of the New Forest.