GoldQuestions
UK gold hallmarks complete guide
Hallmarks can help identify precious metal items, especially jewellery, but they need to be read in context and should not be treated as a complete authenticity guarantee.
Last reviewed: 2026-06-01
What a hallmark can tell you
A UK hallmark may show the sponsor or maker mark, assay office, metal fineness, and sometimes a date letter or commemorative mark. The exact marks depend on item type and the rules in force when it was marked. Hallmarking is most relevant for jewellery and fabricated precious-metal items, where a buyer needs an independent indication of metal content. It is useful evidence, but it should be read as part of a wider check.
How to read marks carefully
A sensible reading starts with the fineness mark, then the assay office, then the sponsor or maker, then date or convention marks where present. Marks can be worn, partial, altered, or misread. Imported items and antique pieces may follow different conventions from modern UK jewellery. Online hallmark charts can help, but valuable or unusual items deserve professional interpretation, especially when sale, insurance, or inheritance is involved.
Bullion and jewellery differ
Bullion bars and coins are often identified through mint marks, packaging, dimensions, certificates, and serial numbers rather than jewellery-style hallmark reading alone. A Royal Mint bullion coin, for example, is normally checked against official specifications, not against a jewellery hallmark. Confusing these systems can create false concerns. The right verification method depends on whether the item is jewellery, scrap, a coin, a minted bar, or a cast bar.
Key points
Hallmarks can identify fineness, assay office, and sponsor or maker. A hallmark is not a complete authenticity guarantee. Bullion often uses mint or refiner evidence instead of jewellery hallmarks. Worn, historic, imported, or high-value items may need specialist help. Read the whole item, not one isolated mark. Photographing marks under good light can also make later dealer, insurer, or specialist conversations much clearer.
Educational disclaimer
This guide is educational only and is not financial, investment, tax, legal, or personal advice.
FAQs
Does every gold item need a UK hallmark?
No. Exemptions, age, origin, and item type all matter.
Can hallmarks be faked?
Yes. A hallmark is useful evidence, but it is not a complete guarantee by itself.
Is 750 gold the same as 18 carat?
750 usually indicates 750 parts gold per 1,000, commonly described as 18 carat.
Should I value jewellery using the hallmark alone?
No. A hallmark helps identify metal content, but value can also depend on weight, condition, gemstones, brand, workmanship, and resale route.