How to Tell If Silver Is Real: UK Hallmarks, the Lion Passant and 925 Explained

Wondering how to tell if silver is real? In the UK, you rarely need acid kits or guesswork — the answer is usually stamped into the metal itself. British law has required precious metals to be independently tested and hallmarked for over 700 years, which makes a genuine UK hallmark the closest thing jewellery has to a birth certificate. This guide shows you exactly what to look for: the compulsory marks, what the lion passant means, why a lone “925” stamp proves less than you'd think, and which at-home checks are worth your time. 

Quick answer: the most reliable way to tell if silver is real in the UK is to find the hallmark — a small cluster of stamps containing a sponsor's mark, a 925 fineness mark and an assay office symbol (leopard's head, anchor, rose or castle). That cluster means an independent Assay Office has physically tested the metal. A lone “925” stamp, by contrast, is only a claim. 

How can you tell if silver is real? Find the hallmark

A genuine UK hallmark is the most reliable proof that silver is real, because it can only be applied by one of four government-recognised Assay Offices after the metal has been independently tested. Under the Hallmarking Act 1973, it is illegal to describe or sell an item as “silver” in the UK if it weighs more than 7.78 grams and carries no hallmark. That's not industry convention — it's criminal law, enforced by Trading Standards. 

Grab a jeweller's loupe or your phone camera on full zoom and inspect the clasp, the inside of a band, or the back of a pendant. You're looking for a small cluster of stamped symbols, usually two to four in a row. Found them? You're most of the way to an answer. Every piece in our everyday jewellery collection carries these marks or falls under the legal weight exemption — more on that below. 

What do the three compulsory hallmark symbols mean?

A UK hallmark is a set of official symbols struck into precious metal by an independent Assay Office after the metal has been tested. Every complete UK hallmark contains three compulsory elements: a sponsor's mark, a fineness mark, and an assay office mark. Once you can read those three, no counterfeit stamp will fool you again. 

The sponsor's mark shows who submitted the piece for testing — typically the maker's or brand's initials inside a shield shape. The millesimal fineness mark states the silver content in parts per thousand: 925 in an elongated oval means sterling silver (92.5% pure silver, usually alloyed with copper for strength), while 958 denotes Britannia silver and 999 fine silver. 

The assay office mark tells you where the piece was tested, and each of the UK's four offices has used its symbol for centuries: a leopard's head for London, an anchor for Birmingham, a rose for Sheffield, and a castle for Edinburgh. The word “hallmark” itself comes from Goldsmiths' Hall in London, where the Goldsmiths' Company has assayed precious metals since the 1300s. You may also spot optional extras — a date letter, or a commemorative mark for events like a coronation. 

What does the lion passant mean on silver — and is a 925 stamp enough?

The lion passant — a lion walking with one forepaw raised — is the traditional British mark for sterling silver, used in England since the 1500s. It's now an optional part of the hallmark rather than a compulsory one, but assay offices still apply it widely, and collectors treat it as the classic shorthand for “genuine sterling.” On Scottish-assayed pieces you'll see a lion rampant from Edinburgh instead. 

Here's the distinction that trips people up: a “925” stamp on its own is not a hallmark. Any factory anywhere can stamp 925 onto brass, and plenty do. The stamp only becomes meaningful when it sits alongside a sponsor's mark and an assay office symbol, because that combination means an independent UK authority physically tested the metal. The mistake we see most often is shoppers treating a lone 925 on a marketplace listing as proof — it's a claim, not a verification. If a lookalike bargain seems too good to be true against tested sterling, the difference usually sits in the metal itself, not the design. 

Which at-home silver tests actually work?

At-home tests can rule silver out quickly, but none of them can prove silver is real the way a hallmark can — treat them as a screening step, not a verdict. With that caveat, three are genuinely useful. 

1. The magnet test. Silver is not magnetic. Hold a strong magnet (a fridge magnet is too weak; you want neodymium) near the piece — a firm pull means it's not silver. A word of honesty, though: most convincing fakes use non-magnetic base metals too, so passing this test tells you very little. 
2. The ice test. Silver conducts heat better than any other metal, so an ice cube placed on a silver tray or heavy bangle melts visibly faster than one on steel or glass at the same room temperature. It's a satisfying party trick with real physics behind it, best suited to larger, heavier pieces. 
3. The tarnish check. Real silver tarnishes — that soft grey-to-black film is silver sulphide reacting with sulphur in the air, and rubbing it with a plain white cloth often lifts a faint dark residue. Stainless steel lookalikes stay stubbornly bright. Tarnish is actually a reassuring sign of the genuine article, and it wipes away in minutes with proper care; we've covered the full routine in our guide to caring for your jewellery. 

Skip the nitric acid test at home. It works, but it's corrosive, it permanently marks the piece, and it belongs with a professional. 

No hallmark? Here's what it means (and doesn't)

An unhallmarked piece is not automatically fake — UK law exempts silver items weighing under 7.78 grams, which covers many stud earrings, thin chains, charms and dainty rings. A pair of small sterling studs can be entirely genuine and legally sold with no hallmark at all. Antique and imported pieces add further wrinkles, since older items may carry foreign marks or pre-date current conventions. 

What should raise your eyebrows is a heavy piece with no marks, a “925” that looks freshly and shallowly stamped, plating that's wearing through to a yellow or grey base at friction points, or a price that undercuts the silver it claims to contain. Reputable UK sellers will state fineness plainly and, for hallmarked stock, display the statutory dealer's notice explaining the marks. When you're buying silver as a gift — where you won't be the one wearing and watching it — that paper trail matters even more; it's why every piece in our most popular jewellery gifts collection states its metal and testing status up front. And if the gift in question is for a birthday, our complete guide to birthday jewellery gifts covers how to match the piece to the person once you've settled the metal question. 

When should you get silver professionally tested?

For inherited jewellery, antiques, or any purchase where real money is at stake, professional verification is quick and inexpensive relative to the risk. Any of the four UK Assay Offices — London, Birmingham, Sheffield and Edinburgh — offers testing services, using methods like X-ray fluorescence (XRF) that read the metal's composition without damaging the piece. A local independent jeweller can usually give an informed first opinion too, and will know when something warrants a formal assay. 

Most practitioners would tell you the same thing in the end: learn to read the hallmark and you'll almost never need the tests. It's a five-minute skill that protects every silver purchase you make for the rest of your life. 

The short version of how to tell if silver is real: find the hallmark, check for the three compulsory marks (sponsor, 925 fineness, assay office symbol), take comfort in a lion passant, and treat a lone 925 stamp — or a suspiciously bright, tarnish-proof finish — with polite suspicion. If you'd like to see what honestly marked sterling looks like up close, our birthstone jewellery collection is a good place to start; every stone is set in tested 925 sterling silver — and if you're curious how the stones themselves are verified, our guide to moissanite jewellery applies the same honest-labelling logic to gemstones. 

FAQ

How do I know if my silver jewellery is real or fake?

Look for a UK hallmark first: a sponsor's mark, a 925 fineness mark in an oval, and an assay office symbol (leopard's head, anchor, rose or castle). That cluster means an independent Assay Office tested the metal. No hallmark on a piece over 7.78g sold as silver in the UK is a legal red flag; on lighter pieces, judge the seller and the finish instead. 

Is 925 silver real silver?

Yes — 925 denotes sterling silver, meaning 92.5% pure silver alloyed with 7.5% other metals (usually copper) for durability. The caveat is that a 925 stamp on its own is just a claim; it's only verified when it appears within a full hallmark applied by an assay office. 

What does the lion mean on silver?

A walking lion with a raised forepaw — the lion passant — is the traditional English mark for sterling silver, in use since the 1500s. It's optional under current rules but still widely applied, and Scottish-assayed silver carries a lion rampant instead. Either lion alongside a 925 mark is a strong sign of the genuine article. 

Does real silver stick to a magnet?

No. Silver is not magnetic, so a strong pull toward a neodymium magnet means the piece isn't silver. Bear in mind the reverse isn't proof — many fakes use non-magnetic metals — so the magnet test can only rule silver out, never confirm it. 

Is silver without a hallmark fake?

Not necessarily. UK law exempts silver items under 7.78 grams, so many genuine studs, charms and fine chains are legally sold unhallmarked. Antique and imported pieces may also carry unfamiliar or foreign marks. Weight is the key: a heavy, modern, UK-sold “silver” piece with no hallmark deserves scepticism. 

Does real silver tarnish?

Yes — genuine silver reacts with sulphur in the air to form a grey-black film called silver sulphide, and that tarnish is actually a reassuring sign you own the real thing. It cleans off easily at home. A “silver” piece that never tarnishes at all is more likely stainless steel or another lookalike.