Certificate · Module 5 of 6
Hallmarking and the global assurance systems
The free Foundation teaches the three BIS marks and how to check a HUID. This module teaches the systems — six of them — and what each one warrants in law. The free lesson ends by saying a hallmark certifies purity, not price or provenance. This is what it does certify, jurisdiction by jurisdiction, and what documentation to demand where it certifies nothing at all.
Four things that are not the same thing
| Who asserts it | What it warrants | |
|---|---|---|
| Hallmark | An independent assay office, by law | The fineness, as tested |
| Maker's mark | The maker | Who made it. Nothing about purity. |
| Certificate | Usually the seller | Whatever it says — and it is a document, not a test |
| Assay card | The refiner | The bar it was issued with — if they are still together |
Three of those four are assertions by an interested party. Only one is a test by somebody with no stake in the sale. That is the entire value of a hallmarking system, and why markets without one are structurally different places to buy.
The United Kingdom
The full UK hallmark has five components — three compulsory, two optional.
| Component | Status | What it tells you |
|---|---|---|
| Sponsor's mark | compulsory | Who submitted the item. Initials in a shield: two to five letters, unique, with two fonts and 45 shield shapes so identical initials never collide. |
| Traditional fineness mark | optional | Sterling / Britannia / gold / palladium / platinum. Superseded in 1999. |
| Millesimal fineness mark | compulsory | Which metal, and how pure, 0–1000. Each metal's mark has a differently shaped border, so silver and platinum cannot be confused. |
| Assay office mark | compulsory | London leopard's head · Birmingham anchor · Sheffield rose · Edinburgh castle |
| Date letter | optional | Optional since 1 January 1999. New alphabet every 25 years. |
Below certain weights, no hallmark is required at all: gold and palladium under 1 g, platinum under 0.5 g, silver under 7.78 g. Three of the twelve identification cases you will meet involve unmarked pieces where the absence is entirely legitimate — two legal exemptions and one jurisdiction that does not hallmark. A practitioner who treats "unmarked" as "suspect" will misprice a great deal of honest metal.
The Common Control Mark
The treaty's official title is the Convention on the Control and Marking of Articles of Precious Metals (Vienna, 15 November 1972). "Control of the Fineness and the Hallmarking of Precious Metal Objects" is a common but non-official rendering that appears widely, including in trade material.
The Common Control Mark is "the first international hallmark and accepted in all the Convention's Contracting States" — an article bearing it may enter any member territory without further control or marking. Roughly five million articles a year cross borders under it, and it covers platinum, gold, palladium and silver.
There are 22 Contracting States: Austria, Croatia, Cyprus, Czech Republic, Denmark, Finland, Hungary, Ireland, Israel, Italy, Latvia, Lithuania, Netherlands, Norway, Poland, Portugal, Serbia, Slovak Republic, Slovenia, Sweden, Switzerland and the United Kingdom. Italy acceded on 15 December 2023 as the 22nd. Note that this is not the EU — it includes Switzerland, Norway, Israel and the UK, and excludes Germany, France and Spain.
India, after HUID
BIS, verbatim: the hallmark "consists of 3 marks viz, BIS logo, purity of the article in caratage as well as fineness and six-digit alphanumeric HUID number."
The HUID is "a six-digit alphanumeric number which is unique for each hallmarked item and is traceable." A consumer verifies it in the BIS Care App using the "Verify HUID" feature, which returns the associated jeweller's registration number — that is what makes the mark traceable rather than merely present. The hallmark is valid for the lifetime of the piece; the three-year validity applies to an Assaying and Hallmarking Centre's recognition, not to the mark.
On the consumer remedy, quote the regulation and stop. BIS (Hallmarking) Regulations 2018, reg. 49(1):
"compensation shall be two times the amount of difference calculated on the basis of shortage of purity for the weight of such article sold and the testing charges"
The "two times" multiplier grammatically attaches to the difference amount; whether the testing charges are also doubled or merely added is not resolved by the wording. BIS's own plain-language gloss treats it as twice the shortfall plus testing charges. A practitioner who over-specifies a remedy they have not read is the failure mode here.
The United States: no hallmarking, regulated stamping instead
No compulsory hallmarking, no assay offices, no third-party assay requirement. What is regulated is truthful stamping, under the National Gold and Silver Stamping Act of 1906 (15 U.S.C. §§ 291–300): applying a false quality mark is an offence, and a registered trademark must accompany any quality mark.
And there is a genuine divergence between the statute and the FTC's own guidance that is worth knowing.
| Statute, 15 U.S.C. § 295 | FTC Guides, note to § 23.3(d) | |
|---|---|---|
| Karat gold, no solder | 3 parts per thousand | 3 parts per thousand |
| Karat gold, with solder | 3/1000 for a watchcase or flatware; 7/1000 for any other such article | 7/1000 (flat) |
| Sterling silver, no solder | 4 parts per thousand | 4 parts per thousand |
| Sterling silver, with solder | 10 parts per thousand | 10 parts per thousand |
The FTC's simplification drops the statutory watchcase-and-flatware carve-out, which remains law. The statute governs; the FTC note is what most practitioners cite.
A US "14K" stamp is the maker telling you what they believe. A UK "750" beside a leopard's head is an assay office telling you what they measured. Both are legal, both are normal, and they are not the same kind of claim. Buy across those two markets treating the marks as equivalent and you have mispriced the risk.
One caution on scope: only the United States position has been verified against primary sources here. Canada and Australia are commonly described as marking-regulation-without-assay regimes, but that was not confirmed. Say "the United States, for example" and stop.
The United Arab Emirates
Stamping is compulsory, under Cabinet Resolution No. 45 of 2018 (made under Federal Law No. 11 of 2015).
- Article 4 — no sale unless stamped with the official stamp or attached to a label.
- Article 6 — the stamp carries a metal trademark: falcon for gold, castle for silver, palm for platinum — plus a purity rank mark and a form identifying the stamping agency.
- Article 8 — minimum legal purity below which an item is "low-carat": gold 500/1000, silver 800/1000, platinum 850/1000. Note that 500 is below 14k; the UAE floor is permissive by European standards.
In Dubai, assaying is operated by the Dubai Central Laboratory (Dubai Municipality) — accredited as the reference laboratory for precious stones and metals under ISO/IEC 17020:2012, and the 13th member of CIBJO.
One currency note: the 2018 Resolution names ESMA as the approving body. ESMA was folded into the Ministry of Industry and Advanced Technology in 2020, and the UAE's national standards body is now MoIAT-SAS — confirmed against ISO's own member register. Quote the Resolution as written and note the successor.
What a provenance claim actually proves
Serials, tamper-evident packaging, surface-fingerprint systems, blockchain provenance. These are bar assurance mechanisms — note that hallmarking applies to articles of precious metal, jewellery and wares, and not to investment bars at all.
A blockchain record proves that a record has not been altered. It proves nothing about whether the record matched the metal at the moment it was written. The gap between the digital claim and the physical object is exactly where the fraud lives — and in the 2012 New York case from Module 4, the serial numbers were legitimate.
A practitioner who cannot articulate that gap will be sold something.
What this module cannot tell you
It cannot tell you what a piece is worth. A hallmark certifies fineness as tested and identifies the sponsor and the office. It says nothing about price, provenance or workmanship — and the gap between "genuinely 22k" and "well bought" is the entire subject of Module 6.
Mark identification set
Twelve marks or descriptions. For each, decide what it tells you — and in three cases, what an absent mark does not tell you. Enter the number that matches.
1. A UK piece with a leopard's head, 750, and a sponsor's mark, but no date letter.
2. A 0.8 g unmarked gold pendant offered in the UK.
3. A 6 g unmarked silver item in the UK.
4. An Indian piece carrying four marks including a jeweller's identification mark.
5. A US piece marked 14K beside a registered trademark.
6. An octagonal shield combining an assay office mark, a responsibility mark, the metal and the fineness.
7. A mark reading PT950.
8. A piece stamped 1/20 12K G.F.
9. A piece marked only 'gold plated', with no fineness stamp.
10. A piece marked VERMEIL.
11. A falcon stamp with a purity rank mark, bought in Dubai.
12. A piece stamped 958 with an anchor.
Twelve questions, drawn at random
Twelve of forty banked questions, in a different order every time you reload. Self-check: the answers are in this page, because nothing here is assessed. The same bank is used for the marked version that comes with enrolment, where it is served and graded server-side.
Kept in this browser only — no account, and nothing is sent anywhere.
Educational content only. Not financial, investment or tax advice. Aurix does not buy, sell, store or broker metal, and does not quote executable prices.