Hallmarking Checker
Hallmarking Checker answers the question every UK maker meets eventually: do I need a hallmark for this piece? Answer four short questions, metal, precious-metal weight, how you plan to describe or sell it, and whether you are selling in the UK, and see whether UK hallmarking rules require a hallmark, including the hallmark weight exemption threshold for your metal, with the reasoning and sources behind the answer. It runs entirely in your browser, works offline once loaded, and there is no account: nothing you enter leaves your device. Useful whether you are a maker selling handmade pieces, a brand owner using AI or CGI renders, or simply unsure whether a piece needs assaying.
How it works
Answer four questions about your piece
Select the metal, gold, silver, platinum, or palladium, enter the precious-metal weight in grams, say whether you will describe or sell the piece as precious metal, and confirm whether you are selling in the UK. The checker weighs your answers against the Hallmarking Act 1973 and tells you, with its reasoning and sources, whether a hallmark is legally required.
See the weight exemption threshold
Gold under 1g, silver under 7.78g, platinum under 0.5g, and palladium under 1g fall under the weight exemption and do not need a hallmark. At or near the boundary, the checker tells you to confirm with your assay office rather than guess.
Check your AI-generated or CGI imagery
Answer three questions about any AI-generated or CGI images you use to sell a piece, and the checker summarises the CAP Code misleadingness rules, 3.1 and 3.7, including the point that labelling an image AI-generated does not on its own fix a misleading impression. It also offers guidance, clearly labelled as guidance and not legal advice, on honest framing for made-to-order renders.
The hallmark components
A full UK hallmark is built from three compulsory marks plus an optional date letter. Useful for reading a hallmark you already have, or knowing what to expect back from an assay office.
Sponsor's mark
Compulsory. Identifies the maker or sponsor who submitted the piece for hallmarking.
Millesimal fineness mark
Compulsory. States the precious-metal purity in parts per thousand.
Assay office mark
Compulsory. Shows which of the four UK assay offices, Birmingham, London, Sheffield, or Edinburgh, tested and marked the piece.
Date letter
Voluntary. Marks the year the piece was hallmarked.
Dealer's Notice
Required wherever hallmarked or exempt precious metal is sold, and displayed at the point of sale.
The checker covers new, single-metal articles sold in the UK, using the Hallmarking Act 1973 weight exemption thresholds. Mixed-metal articles and antique exemptions are not covered in this version: if your piece falls into either category, confirm directly with your local assay office. It is an educational tool, not legal advice, and states the date the law was checked.
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