Those tiny stamps on the back of a ring or the clasp of a necklace are a piece’s identity card. Hallmarks and maker’s marks can tell you what a piece is made of, who made it, sometimes where and when — and they are often the single biggest clue to value. Here is how to find and read them.
Part of our Vintage Jewelry Guide. This is a deep dive on one topic from our complete resource for collectors. Read the full Vintage & Costume Jewelry Guide →
Where to look
Marks are small and easy to miss. Check the inside of ring bands, the backs of brooches and pendants, the clasps and end-tags of necklaces and bracelets, and earring posts or backs. A loupe or magnifier and good light make all the difference — many marks are tiny and worn.
Metal purity marks
The most useful marks tell you the metal. For gold: 10K, 14K, 18K, 22K, or the equivalent fineness numbers 417, 585, 750, 916. For silver: 925 or “sterling.” For platinum: “PLAT,” “PT,” or 950. These indicate precious-metal content and are the first thing to look for — though plating marks (like “GP” for gold plated, “GF” for gold filled, or “EP” for electroplate) signal the piece is not solid.
Maker’s marks and signatures
A maker’s mark identifies who made the piece — a company name, initials, or a small symbol. On fine jewelry this can be a registered maker’s mark; on costume jewelry it is usually a designer signature (Trifari, Coro, Miriam Haskell, and many more). A recognized mark can raise value significantly, so it is worth identifying carefully.
Assay and date marks (and country clues)
Some countries, notably the UK, use a formal hallmarking system with additional symbols: an assay-office mark (which city tested the metal) and a date letter (the year), alongside the fineness mark. Other countries have their own conventions. These marks can pin down where and when a piece was made — valuable context for both identification and value.
What “no marks” means
An unmarked piece isn’t necessarily costume or fake. Marks wear off, some older and handmade pieces were never marked, and marks can be lost during sizing or repair. Absence of a mark is a clue to investigate further — by testing the metal and examining construction — not a verdict on its own.
Beware faked and altered marks
Because marks drive value, they are sometimes faked or altered — added to imply higher gold content, or forged designer signatures on costume pieces. Genuine marks are usually crisp and consistent with the piece’s age and construction. For anything valuable hinging on a mark, get a professional opinion or test rather than trusting the stamp alone.
Record the marks you find
Hallmarks are exactly the kind of detail worth capturing — they identify and value a piece, and they are easy to forget across a collection. Relicara keeps a per-piece record with photos of the marks, materials, and values. Trying to work out whether a piece is precious or costume in the first place? See is inherited jewelry real gold or costume, or read the full vintage jewelry guide.
