The short answer
A “925” stamp proves nothing on its own: it is the maker’s claim, and anyone can strike it. The strongest everyday evidence in India is a BIS hallmark. Since 1 September 2025, a BIS silver hallmark can carry a six-character HUID that you can look up in the BIS Care app, which shows the purity, the date and the testing centre. Silver hallmarking is voluntary, so an unhallmarked piece is not automatically fake. For those, combine a careful visual check, the weight and price, a written invoice stating “925 sterling silver” and the weight, and if needed a non-destructive test at a jeweller or assaying centre. Magnet, ice and bleach tests cannot confirm 925.
For what sterling, German silver and plated metal actually are, see our silver jewellery guide. This article is the practical checklist.
What “925” means
Sterling silver is 925 parts per thousand silver, 92.5% by weight. The rest is usually copper, which makes it harder and more durable than pure silver. The US jewellery guides, for instance, define “sterling” as at least 925/1,000 pure silver (16 CFR §23.5). In India, 925 is one of the purity grades in the BIS silver standard (IS 2112).
Other numbers you may see:
- 999 is fine silver.
- 958 is Britannia standard.
- 970 and 990 are high purities used for some traditional pieces.
- 800 and 835 are lower grades.
All of these are BIS grades under the 2025 standard (PTI, 2025).
Step 1: stamps that are not proof
These marks are commonly struck by makers and sellers:
| Mark | What it claims | Proof? |
|---|---|---|
| 925, S925, .925, 92.5 | Sterling purity | No: a claim only |
| STERLING, STER | Sterling purity | No |
| SILVER, SLV | “Silver”, often without purity | No, and vague |
| 999, FINE | Fine silver | No |
| EPNS, NS, “German silver”, “alpaca” | Plated or nickel silver | These indicate it is not solid silver |
A crisp “925” on an inexpensive piece means only that someone stamped it. Counterfeit stamps are cheap and widespread. The hallmark is what matters.
Step 2: look for a BIS hallmark and check the HUID
India revised its silver standard to IS 2112:2025. From 1 September 2025, HUID-based hallmarking of silver jewellery and articles became available on a voluntary basis (PTI via The Week, 4 September 2025).
The current silver hallmark has three parts:
- The BIS Standard Mark, with the word SILVER.
- The purity grade, for example 925.
- A six-character HUID (Hallmarking Unique Identification) code, unique to that article.
To verify it, open the BIS Care app (BIS apps), choose HUID verification and enter the code. For silver hallmarked after 1 September 2025, it shows:
- the article type
- the purity grade
- the hallmarking date
- the testing centre’s details
- the jeweller’s registration number
The article type and purity should match what you are holding.
Older silver may carry the earlier four-component hallmark used under IS 2112:2014. It has no HUID, so it cannot be looked up in the same way.
What a hallmark means: the article was tested at a BIS-recognised Assaying and Hallmarking Centre. There were about 230 such centres for silver in 87 districts when the scheme launched. The BIS standard for assaying silver is IS 2113 (BIS hallmarking FAQs).
If there is no hallmark: that is common, because the scheme is voluntary. Move on to the other steps, and consider asking the seller to have it hallmarked.
Step 3: inspect with a 10× loupe
In good daylight, with a loupe, look at:
- Wear points (inside a ring, bracelet links, clasp edges, the back of a pendant). A yellow, pink or coppery colour where the surface has rubbed suggests plated base metal.
- Solder joints (where a ring shank meets a setting, or jump rings close). These should be neat and silver-coloured. Look for a seam or colour difference.
- Edges of the plating. A sharp line between bright white and a duller or yellower metal can mark worn plating.
- The stamp itself. Is it sharp and evenly struck, and on a sensible place such as the inside of the band, the clasp or the bail? A stamp on a separate tag only tells you about the tag.
- Findings. Clasps, springs, ear wires and bead caps are sometimes a different metal from the main piece. A good listing names them.
None of these proves 925, but they catch many plated pieces.
Step 4: sense-check weight and price
Sterling silver is priced largely by weight. Ask for the weight in grams, look up the day’s silver rate, and take 92.5% of it to estimate the metal value. Making charges come on top. If the total price is below the metal value, the piece is probably not sterling, or the weight is wrong. Our guide to how silver jewellery prices are calculated shows the arithmetic step by step.
For example, if a listing gives 20.0 g of 925 silver, the silver content is 20.0 × 0.925 = 18.5 g of fine silver. Multiply that by the day’s rate per gram and compare it with the asking price.
Step 5: understand the home tests, and their limits
| Test | What you would see | Why it cannot confirm 925 |
|---|---|---|
| Magnet | Silver is not attracted | Brass, copper, German silver and many other base metals are not attracted either. Only useful to rule out steel |
| Ice cube | Ice melts fast on a thick silver bar (high thermal conductivity) | Unreliable on thin jewellery; copper also conducts well; plating confuses it |
| “Does it blacken?” | Real silver tarnishes | Plated items tarnish too, on the surface. Tarnish shows silver on the surface, not 925 throughout |
| Bleach or chemical rub | Silver darkens quickly | Damages the piece; tests only the surface; never on stone-set items |
| Acid (nitric) scratch test | Reaction colour at a scratch | Destructive; needs a trained tester; a shallow scratch on plating reads as the plating |
Step 6: professional, non-destructive testing (XRF) and its limits
Many jewellers and assaying centres use X-ray fluorescence (XRF) analysers. They give an alloy reading in seconds without damaging the piece. The key limitation is that XRF reads mainly the surface layer:
- A silver-plated item can read as high-purity silver if only the surface is analysed. Instrument makers note that plated items can look like solid precious metal on a surface reading, with analysis depths typically quoted in the range of roughly 10–20 microns for benchtop units (GemOro).
- The usual workaround is to test the original surface, then a small discreet spot that has been lightly filed, and compare the two.
- Plating thickness can be measured by XRF at specialist offices. The UK Assay Office, for example, says it uses XRF to determine the composition and thickness of plating layers (Assay Office).
Ask the tester: was this a surface reading or a filed spot, and does the instrument have a plating-detection mode?
Assaying (the formal chemical determination of fineness, as under IS 2113) is what hallmarking centres use. It is the reference method, but a consumer rarely needs it for a single piece.
Step 7: invoice and return terms
Before you pay, make sure the invoice states:
- the metal and purity (“925 sterling silver”)
- the gross weight and, for stone-set pieces, the net silver weight
- the HUID, if hallmarked
- the price split into silver value and making charges, where the seller provides it
Read the return terms for what happens if the metal does not match. Some sellers distinguish ordinary returns from authenticity claims. On a GemKrishna silver listing we checked, for example, ordinary returns refund silver by metal weight only and exclude making charges, while a verified authenticity claim refunds the full amount under its money-back guarantee (listing, checked 9 October 2026). That listing also describes the pendant as “925 sterling silver, BIS hallmarked” while offering BIS hallmarking as a paid add-on, and it does not mention a HUID. With any listing like this, ask the seller to confirm in writing whether your piece will arrive hallmarked and with which HUID. Our buying online safely checklist covers payment and returns.
Practical shop checklist
- Is there a BIS hallmark? Does the HUID check out in BIS Care, with matching type and purity?
- If there is no hallmark, is the stamp in a sensible place, and does the seller state 925 on the invoice?
- With a loupe, do the wear points and solder joints show only silver colour?
- Is the price at least the metal value for the stated weight?
- Are findings and plating named?
- Can the jeweller do an XRF reading on a discreet filed spot if you are unsure?
- Do the return terms cover a metal or authenticity dispute?
FAQ
Is a piece stamped 925 always authentic?
No. A “925” stamp is a claim by whoever struck it, and counterfeit stamps are common. A BIS hallmark with a HUID that you can verify in BIS Care is much stronger evidence.
Can fake silver say 925?
Yes. Plated brass and other base metals are sometimes stamped 925. Check wear points for a coppery or yellow colour, compare the price with the metal value, and look for a verifiable hallmark.
Does real silver turn black?
Yes, over time. Sterling silver tarnishes, darkening from yellowish to brown to black, especially in humidity and with sweat and cosmetics. Tarnish shows there is silver on the surface. It does not prove the whole piece is 925, because plated items tarnish too.
Does the magnet test work?
Only to rule out steel or iron. Silver is not attracted to a magnet, but neither are brass, copper and German silver. “Not magnetic” therefore does not confirm silver.
How can I test silver without damaging it?
Check for a BIS hallmark and verify its HUID in the BIS Care app. Inspect wear points with a loupe, and sense-check the weight against the price. For more certainty, ask a jeweller or assaying centre for an XRF reading. For possibly plated items, a reading on a tiny discreet filed spot is more reliable than a surface reading.
Is silver hallmarking compulsory in India?
As of October 2026, it is voluntary. HUID-based silver hallmarking began on 1 September 2025, and officials said at launch that they would review whether to make it mandatory. Check BIS for the current position.
What does “92.5” on a listing mean?
It means 92.5% silver, the same as 925 sterling. It is still a claim until it is backed by a hallmark, an invoice and, if needed, testing.
Sources
- PTI via The Week: Govt introduces voluntary silver jewellery hallmarking with digital traceability, 4 September 2025.
- BIS: Hallmarking FAQs and BIS Care app, checked 9 October 2026.
- US FTC jewellery guides: 16 CFR §23.5, for the international definition of sterling.
- The Assay Office (UK): plating and XRF; GemOro (instrument maker): XRF analyser information.
- GemKrishna (seller): 925 pendant listing and return terms, checked 9 October 2026.
Next steps
Read our silver jewellery guide, learn how to clean and store silver, or check a seller with our evidence checklist.
