What is a hallmark on jewellery?
By Jared James · Last updated 21 May 2026
Definition
A hallmark is a mark stamped on a piece of precious metal jewellery to confirm the metal's purity and, in some systems, to record the maker's mark, the assay office that tested it and the year it was marked. In the United Kingdom and much of Europe hallmarking is legally required and strictly regulated, with marks certifying that gold, silver and platinum meet stated purity standards. In Australia, hallmarks are not compulsory, though purity stamps like 925 for sterling silver and 750 or 18ct for 18-carat gold are standard practice among reputable jewellers.
Frequently asked questions
- What does a 925 hallmark mean?
- 925 is the purity stamp for sterling silver, indicating the metal is 92.5% pure silver alloyed with 7.5% other metal, usually copper. It is the standard for sterling silver jewellery worldwide.
- Do Australian jewellers have to hallmark their jewellery?
- No, hallmarking is not legally required in Australia. However, most reputable jewellers stamp pieces with purity marks such as 9ct, 18ct or 925 as a matter of professional practice and to give customers confidence.
- What are the four components of a British hallmark?
- A full British hallmark includes the maker's or sponsor's mark, the standard mark showing purity, the assay office mark identifying which office tested the metal, and the date letter indicating the year of assay.
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