STORIES - Hallmarks: How to Read the Stamp on Your Gold

 

Turn a piece of gold jewellery over and, somewhere along the inside of the band or the clasp, you will usually find a tiny stamp. It is easy to overlook, but that small mark carries real information, about what the piece is made of, where it was tested, and sometimes even who made it. Learning to read it means you will never have to simply take someone's word for what you are wearing.

What a Hallmark Actually Is

A hallmark is an official stamp applied by a recognised assay office, confirming that a piece of gold, silver, or platinum has been tested and meets a declared standard of purity. The tradition dates back centuries in Europe, introduced as a way to protect buyers from underweight or diluted precious metals. Unlike a maker's mark, which simply identifies the jeweller or brand, a hallmark is independent proof, a third party has verified what the piece is actually made of.

Not every marking on a piece of jewellery is a true hallmark in this strict sense, which is exactly why it helps to know what you are looking at.

The Purity Number: 750, 585, 375

The most useful number on the stamp tells you the gold content, expressed in parts per thousand rather than karats.

750 means 75% pure gold — the equivalent of 18 karat gold. 585 means 58.5% pure gold (the equivalent of 14 karat gold. 375 means 37.5% pure gold) the equivalent of 9 karat gold.

The remaining percentage is made up of other metals (copper, silver, or palladium, among others)alloyed in to give the piece strength, durability, and, in some cases, its colour. A higher number means a higher gold content, but not necessarily a more durable piece; 18 karat gold is softer than 14 karat, which is one of the reasons many everyday rings are made at 14 karat rather than 18.

Other Marks Worth Knowing

Alongside the purity number, you may find a few other symbols stamped into the metal:

A maker's mark (often initials or a small logo) identifies the jeweller or workshop responsible for the piece.

An assay office mark shows which office tested and certified the metal, and can sometimes indicate the country of origin.

A date letter, used in some hallmarking systems, marks the year the piece was tested, which can be useful when dating an older or inherited item.

Together, these marks build a small biography of the piece, not just what it is made of, but where it has been and who stood behind it.

Where to Look, and What to Do If You Can't Find One

Hallmarks are usually stamped somewhere discreet: the inside of a ring band, the back of an earring post, or along the clasp of a bracelet or necklace. On very fine or delicate pieces, the stamp can be tiny enough to need a loupe to read properly.

If you cannot find a hallmark at all, it does not automatically mean the piece is not gold, some vintage or handmade pieces were never stamped, particularly if they were made outside a formal assay system. In those cases, or whenever you are uncertain, a professional valuation is the most reliable way to confirm exactly what you own.

Small Stamp, Real Reassurance

A hallmark will never be the most eye-catching detail of a piece of jewellery, but it is one of the most honest. It is the metal's own quiet confirmation of what it is and once you know how to read it, you will never look at the inside of a ring quite the same way again.