Why Imitation Jewellery Tarnishes, and How to Slow It Down
Costume jewellery dulls. It is not a defect and it is not usually a sign you bought badly - it is chemistry, and once you know which reaction you are dealing with you can slow it down a lot with very little effort.
Tarnish and wear are two different problems
People say tarnish for both, but they need different responses.
Tarnish is a chemical reaction on the surface. Metal reacts with sulphur and moisture in the air and grows a dull layer. Nothing has been lost - the layer sits on top.
Plating wear is physical loss. A thin coating rubs through and the base metal underneath shows. Nothing will bring that back, so plating is about prevention rather than cure.
Knowing which you have matters, because cleaning helps tarnish and cleaning accelerates plating wear.
The four things that actually cause it
Moisture. Reactions need water. Humidity is enough; a bathroom shelf is the worst storage spot in the house.
Sweat and skin oils. Slightly acidic, and they sit on the metal after wearing. This is why the earring post dulls before the front does.
Perfume, deodorant and hairspray. The single fastest way to ruin a plated finish. Alcohol strips, and the propellants leave a residue that holds moisture against the metal.
Friction. Two pairs sharing a pocket polish each other's high points and abrade pearl fringes.
What to do, in order of how much it helps
1. Get dressed first, jewellery last
Outfit, hair, perfume, wait a moment, then earrings. Free, and it makes more difference than everything else combined.
2. Wipe them dry when you take them off
A dry soft cloth, ten seconds. You are removing sweat and oils before they sit overnight. An eyeglass cloth is perfect.
3. Store each pair separately, somewhere dry
Individual pouches or a lined box with compartments, in a bedroom drawer rather than a bathroom. If you live somewhere humid, a silica gel sachet in the box is worth doing.
4. Keep them out of water entirely
Not just swimming - washing your face, the shower, rain. Water trapped in the hollow of a jhumka dome or behind a bezel-set stone cannot be dried out, and that is where dullness starts and spreads.
What not to do
Do not use silver polish, silver dip, toothpaste, baking soda or an ultrasonic cleaner on oxidised or plated jewellery. All of them are designed to remove a surface layer. On an oxidised piece that layer is the deliberate darkening, and stripping it out of the filigree leaves the design flat and patchy. On a plated piece the layer is the plating.
Do not scrub around stones and fringes with a brush either. Bezel settings and strung beads are held by small wire loops, and pressure loosens them.
What normal ageing looks like
An oxidised pair developing more contrast - lighter high points, darker recesses - is the finish working as intended, not degrading. A plated pair thinning at the post and clasp first is expected; those are the friction points. Neither is a fault.
How long should a pair last
Worn occasionally, kept dry, wiped after wearing and stored separately: years. Worn in the shower, sprayed with perfume and kept loose in a handbag: a season. The difference is entirely in the handling, not in the price.
The full care guide has the short version to keep somewhere. If you are choosing between finishes, oxidised versus gold-plated covers how each one ages, and the range is here.