How to Identify Antique Gold and Silver Hallmarks
If you've ever picked up a piece of antique jewellery and turned it over looking for tiny stamped marks, you've already started reading hallmarks. Those small symbols tell you exactly what the metal is, where it was tested, and when — information that has been legally required on gold and silver in Britain for centuries. Once you know what you're looking at, a hallmark becomes one of the most useful tools in buying and collecting antique jewellery.
What is a hallmark?
A hallmark is an official series of marks stamped into precious metal by an independent assay office — a body authorised to test the metal and certify its purity. The name comes from Goldsmiths' Hall in London, where gold and silver were brought for assay from the 14th century onwards.
In Britain, hallmarking has been a legal requirement for centuries. A goldsmith could not sell a piece without first submitting it for assay, and the marks stamped on by the assay office confirmed that the metal was what the maker claimed it to be. This system of independent verification is one of the oldest forms of consumer protection in existence.
The five marks
A full British hallmark can contain up to five separate marks, each carrying specific information.
The maker's mark — the initials or symbol of the person or firm who submitted the piece for hallmarking. On antique pieces this is often a pair of initials in a cartouche. Identifying maker's marks is a specialist subject in its own right, but on antique jewellery you will often see marks from Birmingham and London workshops.
The assay office mark — identifies which office tested the piece. The four main offices were London (a leopard's head), Birmingham (an anchor), Sheffield (a crown, later a rose) and Edinburgh (a castle). If you can identify the town mark, you have your first piece of information.
The standard or fineness mark — tells you the purity of the metal. On gold this is a number: 375 for 9ct, 585 for 14ct, 625 for 15ct, 750 for 18ct, 916 for 22ct. On silver, the standard mark is the lion passant — see below. On older pieces you may see the carat number alone rather than the millesimal fineness figure.
The date letter — a single letter indicating the year of assay. Each assay office cycled through the alphabet, changing the letter annually. The font style and shield shape changed with each new cycle, which is how the same letter can represent different years at the same office.
The duty mark — a profile of the monarch's head, used between 1784 and 1890 to show that duty had been paid on the piece. Finding a duty mark on a piece immediately tells you it was hallmarked within that window.
Silver hallmarks — the lion passant
Everything above applies equally to silver, with one important addition. British sterling silver carries a lion passant — a lion walking to the left — as its standard mark. This mark has been used since 1544 and is one of the most instantly recognisable symbols in antique metalwork. If you see a walking lion on a piece, you are looking at British sterling silver, guaranteed at 925 parts per thousand pure.
The lion passant appears alongside the assay office mark and date letter just as on gold pieces.
Sheffield plate and EPNS — not all silver-coloured antique metalwork is solid silver. Sheffield plate (pre-1840) is copper fused with a layer of silver and carries no hallmarks. EPNS — electroplated nickel silver — is a base metal with a silver coating, developed from the 1840s onwards. Neither is hallmarked and neither contains solid silver, though both are collectable in their own right. If there are no hallmarks on a silver-coloured piece, it is worth checking whether it is plate rather than solid silver.
The duty mark on silver — as on gold, a monarch's head duty mark between 1784 and 1890 confirms the piece was hallmarked within that period. On silver this is a particularly useful shortcut — finding a duty mark immediately gives you a broad date range to work with before you even look at the date letter.
Maker's marks on silver — typically initials in a cartouche, just as on gold. On silver the cartouche shape often differs from gold pieces made at the same office and period, which can help with identification.
Reading the date letter
The date letter is the most useful mark for dating a piece, but it requires some knowledge to read correctly because the same letter appears in multiple cycles at each office. The key is to look at three things together: the letter itself, the font style, and the shape of the punch surrounding it.
At Birmingham, for example, the letter A appears in 1773, 1799, 1825, 1850, 1875, 1900, 1925 and 1950 — and each time it looks different. The 1825 A is bold gothic uppercase. The 1875 A is roman uppercase in a cut-corner punch. The 1900 A is gothic lowercase in a dark cusped punch. The 1950 A is plain roman uppercase in a square punch.
This is why the punch shape matters as much as the letter itself. A gothic lowercase letter in a dark cusped punch is Birmingham 1900–1924. The same gothic lowercase in a plain square punch is Birmingham 1849–1874. You cannot read one without the other.
The carat marks — a note on 15ct gold
One of the most useful things a hallmark can tell you about antique jewellery is the carat of the gold, and one carat mark in particular is worth knowing.
15ct gold was an official British standard from 1854 to 1932, when it was abolished and replaced by 14ct. If you find a piece marked 15ct or 625, it was made before 1932 — that mark alone confirms antique status. The same applies to 12ct gold, used in the same period and now extremely rare.
9ct gold was introduced in 1854 and remains the most common carat found in British antique jewellery. 18ct is found on higher quality pieces and is particularly common on French and continental gold. 22ct appears on Georgian pieces and is rarely found in everyday jewellery.
Pre-hallmarked and foreign pieces
Not everything you encounter will carry a full British hallmark. Georgian jewellery predating 1854 may carry only a carat mark or maker's mark. French gold carries its own system — an eagle's head for 18ct, an owl for imported pieces — which is a subject in its own right. Some pieces carry no marks at all, either because they predate legal requirements, because they were made abroad, or because the marks have worn away over time.
The absence of a hallmark does not mean a piece is not gold or silver. A jeweller's loupe, or an XRF analyser will confirm the metal regardless of what marks are present. For antique pieces, an experienced eye can often date a piece by style and construction even without readable marks.