When buying second-hand jewellery, understanding hallmarks and stamps is essential to ensuring you get an authentic and valuable piece. These small engravings provide key details about the metal’s purity, origin, and sometimes even the jeweller who crafted it. In this guide, we’ll explain the most common jewellery hallmarks and what they mean, helping you make informed purchases.
What Are Hallmarks and Why Do They Matter?
A hallmark is an official stamp found on precious metal jewellery that confirms its metal content and authenticity. In the UK and many other countries, hallmarking is a legal requirement for selling gold, silver, platinum, and palladium jewellery above a certain weight.
Hallmarks serve three key purposes:
- Authenticating precious metals – Preventing fraud and misrepresentation.
- Determining metal purity – Indicating the percentage of gold, silver, platinum, or palladium in the piece.
- Tracing origin and maker – Some hallmarks reveal the manufacturer, year, and assay office that tested the jewellery.
Where to Find Hallmarks on Jewellery
Hallmarks are usually located in discreet places on jewellery, such as:
- Inside the band of rings
- On the clasp of necklaces and bracelets
- On the back of pendants
- Inside watch cases
If a piece doesn’t have a hallmark, it may be very old (pre-hallmarking laws), plated, or not made from precious metal.
Common UK Hallmarks and Their Meanings
In the UK, hallmarks are applied by official Assay Offices in London, Birmingham, Sheffield, and Edinburgh. A full hallmark consists of three compulsory symbols:
1. The Metal Purity Mark (Fineness Mark)
This indicates how much pure metal is present in the piece, measured in parts per thousand.
| Metal | Hallmark Example | Purity |
|---|---|---|
| Gold | 375, 585, 750, 916, 999 | 9ct, 14ct, 18ct, 22ct, 24ct |
| Silver | 800, 925, 958, 999 | Sterling Silver (92.5%), Britannia Silver (95.8%) |
| Platinum | 850, 900, 950, 999 | 85%, 90%, 95%, or 99% pure platinum |
| Palladium | 500, 950, 999 | 50%, 95%, or 99% palladium |
Example: If you see "750" inside a gold ring, it means the piece is 18ct gold (75% pure gold).
2. The Assay Office Mark
This identifies the official UK Assay Office that tested and hallmarked the piece:
- Leopard’s Head – London
- Anchor – Birmingham
- Rose – Sheffield
- Castle – Edinburgh
Example: A hallmark that reads "750 Anchor" means 18ct gold, hallmarked in Birmingham.
3. The Sponsor’s or Maker’s Mark
This is a unique stamp representing the manufacturer or brand that submitted the jewellery for hallmarking.
Example: "AP" might stand for Andrew Pinter Jewellery. Each registered maker has a unique mark.
Additional Optional Hallmarks
Some jewellery also carries extra marks that provide more detail about the piece:
- Date Letter – Older pieces may have a letter corresponding to the year they were assayed.
- Commemorative Marks – Special symbols used for events like the Queen’s Jubilee.
- Import Marks – If a piece was made abroad but sold in the UK, it may have an import hallmark.
International Hallmarks
If you’re buying second-hand jewellery from outside the UK, you might come across different hallmarking systems:
USA:
- Stamped with purity (e.g., “14K” or “18K” for gold).
- May include “Sterling” for silver, meaning 92.5% purity.
European Countries:
- Use numeric fineness marks like “585” (14ct gold) or “925” (silver).
- Some include an additional maker’s mark.
France:
- Look for symbols like the Eagle’s Head (18ct gold) or Minerva’s Head (sterling silver).
How to Identify Fake or Misleading Hallmarks
Not all hallmarks are genuine! Some dishonest sellers may stamp fake hallmarks to deceive buyers. Here’s how to spot potential fakes:
- Blurry or uneven engravings – Real hallmarks are crisp and well-defined.
- Incorrect purity marks – A gold ring marked “925” is suspicious (925 is for silver!).
- No Assay Office stamp – In the UK, legitimate hallmarked jewellery should have an assay mark.
- Fake brand logos – Counterfeit jewellery often mimics famous designers but with slight differences.
How to Verify Hallmarks on Second-Hand Jewellery
- Use a Magnifying Glass or Loupe – Check for clear, official stamps.
- Look Up the Maker’s Mark – Websites like the Assay Office database allow you to verify manufacturer’s marks.
- Get a Professional Appraisal – A reputable jeweller can confirm whether the hallmarks are genuine.
Final Thoughts
Understanding hallmarks and stamps is a crucial skill when buying second-hand jewellery. These small engravings reveal a wealth of information about a piece’s metal purity, origin, and authenticity. Always check hallmarks before making a purchase and, when in doubt, consult a professional jeweller to verify their legitimacy.
Looking to buy or sell second-hand jewellery? Make sure to check the hallmarks first!