What Is 925 Sterling Silver? Hallmarks, Tarnish, Value and Care Explained
925 sterling silver is 92.5% pure silver mixed with 7.5% other metals, usually copper. The "925" stamp means 925 parts per thousand are silver.
Pure silver is too soft for everyday jewellery, so the small amount of copper makes it strong and durable while keeping silver's bright colour. Sterling silver can tarnish, but it is real, precious silver and lasts for decades with simple care.
Fine silver vs sterling silver vs silver plated
| Type | Silver content | Mark | Durability | Typical use |
|---|---|---|---|---|
| Fine silver | 99.9% | 999 | Very soft, scratches easily | Bullion, some handmade pieces |
| Britannia silver | 95.8% | 958 | Soft | Traditional British silverware |
| Sterling silver | 92.5% | 925 | Strong, everyday wear | Most quality jewellery |
| Silver plated | Thin silver layer over base metal | EP, EPNS or none | Plating wears through | Fashion jewellery |
| "Silver tone" | No silver | None | Varies | Costume jewellery |
UK hallmarking explained
In the UK, the Hallmarking Act 1973 makes it an offence to describe an item as silver unless it is hallmarked, with one key exemption: silver items weighing under 7.78 grams do not require a hallmark. That covers most dainty earrings, small pendants and fine chains, which is why many genuine sterling silver pieces carry only a "925" stamp or no mark at all.
A full UK hallmark has three compulsory marks:
- Sponsor's mark: the initials of the maker or importer.
- Fineness mark: 925 for sterling silver.
- Assay office mark: leopard's head (London), anchor (Birmingham), rose (Sheffield) or castle (Edinburgh).
How to tell if silver is real
- Look for a stamp: 925, STER or STERLING, often on clasps, earring posts or inside rings. Remember small pieces may be legally unmarked.
- Magnet test: silver is not magnetic. If a piece snaps to a strong magnet, it is not solid silver (springs in clasps may still be magnetic).
- Tarnish: real silver gradually darkens; a polishing cloth turning grey is a good sign.
- Buy from transparent sellers who name the metal and test their products.
Why does sterling silver tarnish?
Tarnish is a thin layer of silver sulphide that forms when silver reacts with sulphur in the air. Humidity, perfume, cosmetics and certain foods speed it up. Tarnish is not rust and does not mean a piece is fake; in fact, it is one sign of real silver. It wipes off with a polishing cloth or a gentle clean. See our step-by-step guide on how to clean sterling silver and gold-plated jewellery.
Rhodium-plated and gold vermeil sterling silver
- Rhodium plated: a thin layer of rhodium, a platinum-group metal, gives sterling silver a bright white shine and extra tarnish resistance. Often described as a "platinum finish".
- Gold plated sterling silver / vermeil: gold over a sterling silver base gives you a gold look on a precious, skin-friendly core. Gold vermeil usually means a thicker gold layer.
- Oxidised silver: deliberately darkened recesses that add contrast to a design. Do not use silver dips on these.
CHELSEA Sterling Silver Solitaire SetSolid 925 sterling silver with a rhodium (platinum) finish and AAAAA cubic zirconia.
View CHELSEA set →
Beck Gold Layering Necklace SetHandcrafted from 925 sterling silver with an 18K gold plating.
View Beck set →
925 Sterling Silver Knot HoopsGenuine 925 sterling silver in a sculptural, everyday hoop.
View Knot hoops →
ROSIE Sterling Silver Skinny ChainHandcrafted sterling silver skinny chain, finished in silver or gold tone.
View ROSIE chain →
Is sterling silver good for sensitive skin?
For most people, yes. Sterling silver is alloyed with copper rather than nickel, so it is a low-risk choice for sensitive ears and skin. Rarely, people react to copper or to tarnish. Choosing pieces that are tested for nickel release adds extra peace of mind. All products are EU batch tested for Nickel, Lead, and Cadmium compliance.
Is sterling silver worth buying?
- Durable: with basic care, sterling silver jewellery lasts for decades.
- Real precious metal: it contains genuine silver, unlike plated or costume jewellery.
- Affordable luxury: it costs far less than gold or platinum while looking just as refined.
- Resale: scrap value depends on weight and the silver price, so dainty pieces are bought for wear rather than as an investment.
How to care for sterling silver
- Wear it often; gentle friction slows tarnish.
- Take it off before swimming, showering, exercising and cleaning.
- Wipe with a soft cloth after wearing.
- Clean with warm water and mild soap every few weeks; dry thoroughly.
- Store in an airtight pouch or box with an anti-tarnish strip.
Frequently asked questions
What does 925 mean on jewellery?
925 means the metal is 92.5% pure silver, the legal standard for sterling silver. The remaining 7.5% is usually copper, added for strength.
Will 925 silver turn my skin green?
It rarely does. Occasionally the copper in the alloy reacts with sweat or lotion and leaves a faint green mark, which washes off and is harmless. Keeping the piece clean and dry prevents it.
Can I wear sterling silver every day?
Yes. Sterling silver is designed for everyday wear. Remove it for swimming, showering and the gym, and it will stay bright for years.
Does 925 silver rust?
No. Silver does not rust. It can tarnish, which is a surface layer that can be cleaned off.
Is unmarked silver fake?
Not necessarily. In the UK, silver items under 7.78 grams are exempt from hallmarking, so many small genuine pieces are unmarked or carry only a 925 stamp.
Is sterling silver better than gold plated jewellery?
Sterling silver is solid precious metal throughout, so it can't wear through like plating can. Gold-plated sterling silver combines both: a gold look on a silver base.
Key takeaways
- 925 sterling silver = 92.5% pure silver, usually alloyed with copper.
- In the UK, silver under 7.78 g doesn't need a hallmark.
- Tarnish is normal and removable; silver does not rust.
- It's a low-risk choice for sensitive skin.
- With simple care, sterling silver jewellery lasts for decades.
Discover our sterling silver earrings and silver rings.
