The Small Print Stamped in Gold
A hallmark is a promise struck into metal. It is a set of tiny stamps, punched into a finished piece by an independent assay office after testing, that certify what the metal is, where it was tested, and often who made it and when. Learning to read them is the single most useful skill in antique jewelry: a hallmark turns "looks like gold" into evidence, and it is the first thing we look for on every piece that crosses the bench at Royal Regency — before the stones, before the style, before the price.
Not every country hallmarks the way Britain does, and not every old piece carries marks at all. But where marks exist, they are the piece's own paperwork, stamped at the time it was made. Here is how to read them.
The Parts of a Hallmark
A full British hallmark traditionally carries up to five stamps in a row. The fineness or purity mark states the metal standard: 375 for 9-carat gold, 585 for 14-carat, 750 for 18-carat, 916 for 22-carat, and 999 for fine gold. Sterling silver is 925, and Britannia silver is 958. Older British silver uses symbols instead of numbers — a lion passant (a walking lion) for sterling, a Britannia figure for the higher standard. The assay office mark says where the piece was tested: a leopard's head for London, an anchor for Birmingham, a crown for Sheffield gold (a rose for Sheffield silver), a castle for Edinburgh. The maker's mark — also called the sponsor's mark — is the initials of the maker or firm that submitted the piece, set in a shaped shield. The date letter is a single letter in a distinctive font and shield shape; each office ran its own alphabet cycles, so the letter, its style and its shield together pinpoint the year. A fifth, optional stamp — a duty or commemorative mark — appears on some periods.
Continental and American pieces play by different rules. French work carries its own state marks, including the eagle's head for 18-carat gold. American jewelry was never centrally hallmarked; it relies on maker-applied quality stamps such as "14K" or "14K GOLD," sometimes with a maker's trademark beside it — useful, but self-declared, which is why American marks are read alongside testing rather than instead of it.
Reading Marks in Practice
Start with a loupe and good light, and look where marks live: inside ring shanks, on the tongues and catches of brooches, on locket rims and the backs of pendants, along chains at the clasp. Work through the stamps left to right — metal first, then office, then maker, then date letter. Marks on a heavily worn piece can be polished nearly flat; a soft strike or a partial letter is normal on a jewel that has been worn for a century, and it is exactly what a cast copy often gets wrong, with marks that look molded rather than punched. When marks are absent altogether — common on early pieces, small pieces, and much American work — the piece is judged the dealer's way: by construction, by stone cuts, and by testing the metal directly.
Common Fakes and Misleading Stamps
The stamps to treat with suspicion are the ones that sound like gold without being it. "HGE" means heavy gold electroplate — a plated piece, whatever karat number precedes it. "GF" is gold filled: a mechanically bonded layer of gold over base metal, thicker than plating but not solid. "Vermeil" is gold plating over sterling silver. "Gold tone" and "gold color" mean no gold content is being claimed at all. A lone "18K" stamp on a piece with no other marks, in a style the stamp's supposed era would not produce, deserves testing before money changes hands. Acid testing and electronic testers give a working answer on fineness; the final word at a dealer's bench is experience backed, when a piece warrants it, by X-ray fluorescence.
This guide covers the reading. The doing — identifying marks on pieces in front of you, with charts of purity marks, office symbols and date letters at your elbow — is what we built the Hallmark Decoder for. You will also find our other dealer guides collected on the Resources page.
Frequently Asked Questions
What does 750 stamped on jewelry mean? 750 parts per thousand fine — 18-carat gold. The number system is universal in modern marking: divide by 1000 and you have the purity. 585 is 14-carat, 375 is 9-carat, and 925 is sterling silver.
Does every genuine antique piece have a hallmark? No. Marking laws varied by country and period, small items were sometimes exempt, and a century of wear can polish marks thin. Absence of marks is a reason to test, not a verdict — many fine Georgian and early Victorian pieces carry few or none.
Can a hallmark be faked? Stamps can be copied, which is why marks are read as a set — purity, office, maker, date letter and style must all agree with each other and with the piece in hand. Cast copies usually show soft, molded-looking marks. When the set disagrees with itself, test the metal.
What is the difference between a maker's mark and a hallmark? Strictly, the hallmark is the assay office's certification; the maker's (sponsor's) mark is one component of the full set, identifying who submitted the piece. In everyday speech "hallmarks" covers the whole row of stamps, and that is how most dealers use the word.
Where should I look for marks on a ring? Inside the shank, opposite the setting, is the usual place. On brooches, check the back plate and the pin stem; on lockets, the rim and the inner covers; on chains, the links beside the clasp and any stamped tags. A 10x loupe and raking light will show stamps your eyes alone will miss.
