Why does sterling silver tarnish?
Tarnish is not dirt and it is not rust. Sterling silver (925) reacts with tiny amounts of sulphur in the air, and on skin, perfume and household fumes, to form a thin, dark layer of silver sulphide on the surface. It builds up faster in humid bathrooms, near rubber or wool, and when a piece is left unworn in the open. The good news: it sits on the surface, so a gentle clean usually brings the shine straight back - the trick is cleaning the metal without touching the stone harshly.
The safe home method (step by step)
- Dry buff first. Most light tarnish lifts with a dry microfibre or dedicated silver-polishing cloth. Rub the metal gently; work around the stone, not over it.
- Mild soapy water for set pieces. If there is grime in the setting, dip a cotton bud or soft cloth in warm water with one drop of mild washing-up soap and wipe the metal only. Keep water away from porous stones.
- Soft brush, gently. For detailed settings, a clean soft (baby) toothbrush lifts grime from crevices. Light pressure only.
- Dry thoroughly. Pat dry with a soft cloth and let the piece air-dry fully before storing. Trapped moisture causes more tarnish and can harm water-sensitive stones.
For a full routine across bracelets and necklaces, see our guide on how to cleanse crystal jewellery safely.
What to avoid - and the geology behind it
The popular "kitchen" tricks work on plain silver but are risky once a stone is involved:
- Baking soda is a mild abrasive. On a soft stone it acts like fine sandpaper, leaving micro-scratches that dull the polish.
- The foil + baking soda "dip" uses a chemical reaction in hot water. Heat and alkaline water can damage glued settings, porous stones and anything water-sensitive.
- Silver-dip liquids are harsh chemical baths that can discolour or etch many gemstones.
- Toothpaste is abrasive (it is designed to be) and will scratch soft stones and even softer metals over time.
- Ultrasonic and steam cleaners shake loose fragile settings and can crack stones that contain water or fractures, such as opal.
It comes down to hardness and porosity. The Mohs scale ranks how easily a mineral scratches. Anything softer than about 6 - and anything porous - is vulnerable to abrasive or wet cleaning.
Quick guide by stone
| Stone | Hardness | Cleaning method |
|---|---|---|
| Amethyst, Rose Quartz, Citrine, Clear Quartz, Tiger's Eye | 7 | Dry cloth; a brief wipe with mild soapy water is fine, then dry. |
| Lapis Lazuli, Turquoise | 5-6 | Dry cloth only. Keep away from water and chemicals. |
| Opal | 5.5-6.5 | Soft dry cloth. No soaking, heat or ultrasonic - opal can craze. |
| Malachite | 3.5-4 | Dry cloth only. Never soak (it contains copper) and never use abrasives. |
| Selenite | 2 | Dry dusting only. Never wet, never scrub. |
For which stones can safely touch water at all, see our water-safe crystals guide.
How to prevent tarnish in the first place
Prevention beats cleaning. Store each piece in a soft anti-tarnish or velvet pouch, separately, so stones don't scratch and air can't reach the silver. Keep jewellery dry, put it on after perfume and skincare, and wear your silver regularly - the natural oils from your skin actually slow tarnishing. For more on the metal itself, see our sterling silver guide, and browse our silver crystal bracelets.
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Frequently asked questions
Can I use a silver dip on gemstone jewellery?
Best not to. Silver-dip liquids are harsh and can etch or discolour many stones, and they can seep into settings. Use a dry silver cloth on the metal instead.
Will baking soda damage my stones?
It can. Baking soda is a mild abrasive and will scratch softer stones like malachite, selenite, turquoise and opal, dulling their polish. Avoid it on any set piece.
How do I stop my silver tarnishing?
Store it dry in an anti-tarnish or velvet pouch, away from humidity and perfume, and wear it often. Tarnish forms fastest on pieces left out in the open.
Can I get my silver gemstone jewellery wet?
A quick splash on a quartz-family stone is fine if you dry it fully, but keep porous and soft stones (lapis, turquoise, malachite, selenite, opal) dry. Remove jewellery before showering or swimming.
