Tarnish, Rust or Worn Plating? How to Tell What Changed
Your ring has changed colour. Before you reach for a cleaning hack, work out what may have changed. A dirty surface, a chemical surface change and a missing coating need different care.
Start with the pattern, not just the colour
These are clues, not a test. The Canadian Conservation Institute's metal guide shows that surface changes depend on the metal and that wear can expose the layer below a plated surface. A photo alone cannot reliably tell you the metal underneath.
Why the distinction saves your jewellery
Imagine a gold-coloured ring with a pale patch underneath the band. That spot rubs against things all day. If the gold layer has worn through, a stronger cleaner will not restore the colour. It may make the patch larger.
Now imagine a pendant with a dull film around its setting. The coating might still be intact. The problem could be residue sitting on top. You need the maker's cleaning instructions before deciding what to use.
A calm three-step check
- Find the order details. Note the base metal, finish, stones and care instructions. “Silver colour” does not mean sterling silver.
- Photograph the change in daylight, including an untouched area. Keep the photo before trying anything.
- If the maker allows it, wipe once with a clean, soft cloth. Use light pressure. If the colour stays changed, stop rather than keep scrubbing.
Do not use a scratch test on a gift. It damages the surface and still may not identify every layer. A household magnet also cannot tell you the full composition of a finished piece.
What should you ask the seller?
Send: “This patch appeared on the underside of my ring. The listing says [material and finish]. Is this residue, a surface change or plating wear? What cleaning or repair do you recommend for this exact piece?”
Mention when it started and any contact with a cleaner or pool water. That helps the seller give useful advice without guessing.
If the finish is missing, read what replating can and cannot fix. If it is silver going dark, start with why silver tarnishes.