You have a piece of jewelry with British hallmarks. You can see several small stamps — a lion, a number, a letter, a symbol. You know these mean something, but you don't know how to read them. Understanding these marks can tell you the metal purity, where it was tested, and when — information that directly affects decisions about selling, insuring, or authenticating.
You can learn to read the basic marks yourself. A British hallmark consists of up to four compulsory marks plus optional maker's marks. Understanding what each one tells you — and what it doesn't — gives you evidence you can verify independently.
Take it to a jeweler. They can read the marks for you.
Decisions this guide supports:
Gold purity marks explained — What 750, 585, and 417 actually tell you about gold content.Unknown marks — does it matter? — Whether an unidentified mark matters depends on your next step.Start by identifying the metal fineness mark (the number). That tells you what the piece is made of — the most immediately useful information. Then look for the assay office mark (the symbol) to confirm where it was tested.
British hallmarks traditionally include: the maker's mark (initials of the maker or company), the metal fineness mark (the purity number like 925 for sterling silver or 750 for 18k gold), the assay office mark (a symbol indicating which office tested the piece — a leopard for London, an anchor for Birmingham, a crown for Sheffield, a castle for Edinburgh), and the date letter (a letter indicating the year of hallmarking, which cycles through the alphabet in different fonts and cases).
The lion passant — a walking lion with one paw raised — is the traditional British hallmark for sterling silver (925 parts per thousand pure silver). It was used by English assay offices from 1544 until 1999, when it was replaced by the numerical 925 mark. If your piece has a lion passant, it was hallmarked before 1999 and is sterling silver.
The date letter alone is not enough — you need to know the assay office and the style (font, case, shield shape) of the letter. Each assay office used its own cycle of letters. Reference tables (available from assay office websites and hallmark reference books) show which letter corresponds to which year for each office. The date letter tells you the year the piece was hallmarked — not necessarily the year it was made.
British hallmarks are among the most regulated and reliable hallmarking systems in the world. The UK Hallmarking Act of 1973 makes it illegal to sell precious metal items described as gold, silver, or platinum without a hallmark from a UK assay office. However, hallmarks can be faked — especially on high-value antique pieces. If authenticity is critical to your decision, have the piece independently verified.
