How to Tell if Silver Is Real: The 925 Sterling Silver Guide

Somewhere in a drawer, you've probably got a piece of jewellery you're not quite sure about. Maybe it was a gift, maybe a market find, maybe something that arrived looking suspiciously shiny from an online order. Knowing how to tell if silver is real shouldn't require a chemistry degree or a trip to a jeweller — and for the most part, it doesn't. A few simple checks, done in the right order, will catch the vast majority of fakes.

We make jewellery in 925 sterling silver at SRVR, so we've handled a lot of the real thing — and, while vetting suppliers, a depressing amount of the fake stuff too. This is the guide we'd hand to a friend: what "925" actually means, which home tests genuinely work, which viral ones don't, and why tarnish — the thing everyone complains about — is quietly one of the best signs you own genuine silver.

What 925 Actually Means: The Hallmark Explained

Pure silver is 99.9% silver, and it's too soft for jewellery — a pure silver ring would bend out of shape in a week. So jewellers alloy it: 925 sterling silver is 92.5% pure silver mixed with 7.5% other metals, usually copper, for strength. That 92.5% is the "925" and it's been the sterling standard for centuries — long enough that it's baked into British coinage history.

So when you see a small "925", "Ster", "Sterling" or "S925" stamp inside a ring band or on a clasp, that's the maker's claim that the piece meets the sterling standard. Note the word claim — and this is the honest bit most guides skip: a 925 stamp can be faked. Dishonest sellers stamp "925" onto plated brass all the time, particularly on marketplace sites. A stamp is a good first sign, never final proof.

The UK Hallmark: What British Buyers Should Look For

Here's where UK buyers have an advantage. Under the Hallmarking Act, silver items over 7.78 grams sold in the UK as silver must carry a full UK hallmark — a set of tiny marks struck by an independent Assay Office after actually testing the metal. A full hallmark typically includes:

• A sponsor's mark — the maker's or importer's registered initials
• The fineness mark — "925" in an oval for sterling
• An Assay Office mark — a leopard's head (London), anchor (Birmingham), rose (Sheffield) or castle (Edinburgh)

Unlike a simple 925 stamp, a hallmark means an independent office has verified the metal. Lighter pieces — thin chains, small earrings, delicate rings under 7.78g — are legally exempt, which is why plenty of genuine sterling jewellery carries only a "925" stamp. Absence of a full hallmark on a small piece isn't a red flag; absence on a chunky bracelet sold in the UK as silver is.

How to Tell if Silver Is Real: Tests That Actually Work

Work through these in order — each one filters out a layer of fakes.

1. The magnet test. Silver is not magnetic. Hold a strong magnet (a fridge magnet is too weak — a neodymium magnet from a hardware shop works) near the piece. If it snaps to the magnet, it's not silver. Caution: plenty of fakes use non-magnetic brass or copper, so passing this test rules out only the laziest counterfeits.

2. The smell test. Genuinely useful and free. Rub the piece between your fingers for thirty seconds and smell it. Real silver has almost no odour. A metallic, coppery, "2p coin" smell means high copper or brass content — likely plated.

3. The polish test. Rub the piece firmly with a soft white cloth. Real silver that's started to tarnish will leave faint black marks on the cloth — that's silver sulphide coming off, and it's a good sign. No marks on an older piece that's never been cleaned is worth a raised eyebrow.

4. The ice test. Silver has the highest thermal conductivity of any metal. Place an ice cube on the piece (flat items work best): on real silver, it melts noticeably faster than on steel or glass beside it. A party trick, but a legitimate one.

5. The wear test. Look at high-friction points — the back of a ring band, chain links near the clasp. Plated pieces eventually show a different colour metal peeking through at these spots, often yellowish brass or pinkish copper. Sterling silver is the same metal all the way through, so wear just exposes... more silver.

6. The professional test. For anything valuable, a jeweller can run an XRF scan — a non-destructive machine reading of the exact metal composition — usually for a small fee or free. Skip the nitric acid kits sold online: they work, but they permanently mark the piece and involve, well, acid. Not worth it for everyday jewellery.

One test to ignore: the "bleach test" that circulates online. Yes, bleach tarnishes silver rapidly — it also damages the piece and proves little, since other metals discolour too.

Does 925 Silver Tarnish? Yes — and That's the Point

This surprises people, so let's be direct: real 925 sterling silver tarnishes. The 7.5% copper in the alloy reacts with sulphur compounds in the air — from pollution, perfume, sweat, even eggs and onions — forming a yellowish, then brown, then black layer of silver sulphide. It's cosmetic, it's completely reversible, and it's normal.

In fact, tarnish is a quiet authenticity check. Cheap "silver-tone" alloys often don't tarnish the way sterling does — they either stay stubbornly shiny or the plating flakes to reveal another colour entirely. If your ring slowly darkens and then polishes back to brilliance with a cloth, that's sterling behaving exactly as sterling should.

Some sterling jewellery is finished with a thin layer of rhodium — a bright, hard platinum-group metal — which dramatically slows tarnish. Whether a specific piece is rhodium-plated depends on the maker [check — confirm whether SRVR silver pieces are rhodium-plated or plain sterling, as this changes care advice].

Keeping Sterling Silver Bright

• Wear it. Genuinely the best anti-tarnish measure — the gentle friction of daily wear keeps sulphide from building up. A 925 sterling silver band worn daily often needs less polishing than one kept "for best".
• Last on, first off. Perfume, hairspray and lotions accelerate tarnish. Put jewellery on after them.
• Store it sealed. A small zip-lock bag with the air pressed out slows tarnish enormously. Anti-tarnish strips help too.
• Polish gently. A dedicated silver cloth handles most tarnish. For heavier cases, warm water, mild soap and a soft brush. Avoid toothpaste — it's abrasive enough to scratch.
• Mind the pool. Chlorine is aggressive towards sterling. Take rings off before swimming or hot tubs.

Red Flags When Buying Silver Jewellery Online

Because most fakes are bought, not inherited, here's what to watch for:

• Vague language. "Silver-tone", "silver-coloured", "silver finish" — none of these mean silver. Honest sellers say "925 sterling silver" plainly.
• Impossible prices. Silver is a traded commodity. A "sterling" cuban chain weighing 50 grams can't retail at £9 — the raw metal alone costs several times that.
• No weight listed. Reputable sellers of solid silver usually state gram weight, especially for chains and bangles. Silence on weight often hides hollow or plated pieces.
• Stock photos with suspicious shine. Real sterling photographs with a soft, slightly warm white lustre. An almost chrome-like mirror finish in every photo can indicate rhodium-plated brass.
• "925" as the entire description. A stamp mentioned in the listing means nothing without the seller committing to "solid sterling silver" in writing — that phrase has consumer-law weight in the UK; a photographed stamp doesn't.

When we describe a piece like our sterling silver signet ring as 925, that's a claim you can hold us to — and the same should be true of anyone you buy from. If you want to see how honest silver is presented (weights, finishes, plain language), have a look through the full rings collection [check — confirm product weights are listed on product pages, or remove that implication].

The Two-Minute Version

Check for a 925 stamp or UK hallmark. Run the magnet, smell and polish tests. Look for wear at friction points. Be suspicious of vague wording and impossible prices. And remember: slow, even tarnishing that polishes away cleanly is the behaviour of real sterling — not a defect, just chemistry.

FAQ

Is 925 silver real silver? Yes — 925 (sterling) silver is 92.5% pure silver alloyed with 7.5% other metals, usually copper, for strength. It's the international standard for silver jewellery. Pure 999 silver is too soft for rings and chains that see daily wear.

Can a 925 stamp be fake? Unfortunately, yes — counterfeiters stamp "925" on plated brass routinely. Treat the stamp as a first check, not proof, and back it up with the smell, magnet and wear-point tests, or an XRF scan at a jeweller for valuable pieces.

Why is my sterling silver turning black? The copper in the alloy is reacting with sulphur in the air, sweat and cosmetics, forming silver sulphide. It's harmless, normal, and reversible with a silver polishing cloth. Rapid blackening usually points to perfume, chlorine or storage in open air.

Does real silver turn your skin green? Rarely. Green marks come from copper reacting with sweat — common with plated or high-copper fakes, occasional with sterling if you have acidic skin chemistry or wear it in the pool. A faint dark grey mark, by contrast, is just silver oxide and wipes off.