What Does 925 Mean on Silver Jewellery? UK Hallmarks Explained

Turn over a silver ring or look at the clasp on a chain and you'll usually spot a tiny stamp: 925. It's one of the most common marks in jewellery, but plenty of people aren't sure what it actually tells them. This guide explains the 925 silver meaning UK shoppers should know, how UK hallmarks work, and how to check what you're buying.

What does 925 mean on silver jewellery?

925 means the metal is 92.5% pure silver. The remaining 7.5% is made up of other metals, most often copper, which adds the strength that pure silver lacks. That mix is called sterling silver, and 925 is simply its fineness mark: 925 parts silver per 1,000.

So if a piece is stamped 925, it's telling you it's genuine sterling silver rather than silver plate or a base metal with a silver-coloured finish. If you'd like the full comparison with fine silver, our guide to pure silver vs. sterling silver covers it in detail.

Why is sterling silver 92.5% and not 100%?

Pure silver (99.9%) is very soft. A ring made from it would scratch and bend with everyday wear, and a chain clasp wouldn't stay secure for long. Adding 7.5% copper makes the metal hard enough to hold its shape while keeping the bright, white look of silver. That balance is why 925 is the standard for rings, chains, bracelets and earrings.

925 stamp vs. UK hallmark: what's the difference?

This is where people often get confused. A 925 stamp is a maker's or retailer's claim about the metal. A hallmark is an independent legal mark applied by a UK assay office after the piece has been tested. The two can appear together, and in the UK a hallmark is the stronger guarantee.

When does silver have to be hallmarked?

Under UK law, silver items weighing more than 7.78g must be hallmarked before they can be sold as silver. Many lighter pieces, such as fine chains, studs and small pendants, fall below that weight and are exempt, which is why not every piece of genuine sterling silver carries a hallmark. Those pieces are usually stamped 925 instead.

What's in a UK hallmark?

A full UK hallmark is made up of a few small marks, usually struck side by side:

• Sponsor's mark: the initials of the maker or company that submitted the piece for hallmarking.
• Fineness mark: the number 925 for sterling silver, often shown inside a distinctive shape. You may also see a lion passant (a walking lion), the traditional symbol for sterling silver.
• Assay office mark: a symbol showing which office tested the piece. London uses a leopard's head, Birmingham an anchor, Sheffield a rose and Edinburgh a castle.
• Date letter: a letter showing the year of hallmarking. This is now optional, so its absence isn't a red flag.

Our UK hallmarking page has more on how this works for our own range.

Where to find the 925 stamp

Because the marks are tiny, it helps to know where to look:

• Rings: on the inside of the band.
• Chains and bracelets: on the clasp, or on a small tag near the clasp.
• Earrings: on the post, the back, or the hoop's closing mechanism.
• Pendants: on the back of the pendant or on the bail.

A magnifying glass or your phone's camera zoom makes them much easier to read.

Does a 925 stamp guarantee quality?

It tells you the metal content, not the whole story. Craftsmanship, finish, clasp quality and how well a piece is made all vary. On its own, a stamp is also only as trustworthy as the seller behind it, so buy from a retailer that is open about its materials and sourcing. You can read how we approach this on our ethical sourcing page.

Other marks you might see on silver

• .925 or 925 STERLING: the same standard, written slightly differently.
• .999: fine silver, 99.9% pure.
• 925 followed by a code or letters: often a maker's mark or factory code.
• "Silver plated", EPNS or "silver tone": a thin layer of silver over another metal. This is not sterling silver.

How to tell if silver is genuine at home

Start with the marks. Then use common-sense checks: real sterling silver isn't magnetic, so a strong magnet shouldn't cling to it (though a non-magnetic result alone doesn't prove it's silver). Over time it may develop a soft grey or yellowish tarnish, which is normal and easy to clean. If a piece is flaking, showing a different metal underneath, or leaving green marks that don't wipe off, it's probably plated.

If you spot light tarnish on genuine sterling, don't worry. Our silver jewellery care guide shows how to bring the shine back.

Shopping for 925 sterling silver

If you're ready to buy, look for clear product descriptions that state 925 sterling silver, plus transparent information on hallmarking. Every chain, ring, bracelet and earring we sell is genuine sterling silver, and you can browse the full sterling silver jewellery range to see everything in one place.

FAQ

Is 925 silver real silver?

Yes. 925 indicates sterling silver, which is 92.5% pure silver mixed with other metals (usually copper) for strength. It's the recognised standard for jewellery.

Is 925 silver the same as sterling silver?

Yes. The terms mean the same thing. 925 is the number stamped on the piece, and sterling silver is the name of the alloy.

Does 925 silver have to be hallmarked in the UK?

Silver items over 7.78g must be hallmarked by a UK assay office to be sold as silver. Lighter items are exempt and are often stamped 925 instead.

Will 925 silver tarnish?

It can. The copper in the alloy reacts with air and moisture over time, but light tarnish is easy to remove with a silver polishing cloth.

Is 925 silver worth buying?

For everyday jewellery, yes. It's durable, widely available and holds its look well when cared for, which is why it's the standard for rings, chains and earrings.

Can 925 silver be fake?

A stamp alone can be applied to anything, so buy from a trusted seller. A UK hallmark from an assay office is the strongest independent proof of metal content.