An Easy Guide to Reading Hallmarks on Gold Jewellery

When shopping for secondhand fine jewellery, one of the most important details to look for is the hallmark. These tiny stamps can tell you a surprising amount about a piece, from the purity of the gold to where it was tested and sometimes even when it was made.

For many buyers, hallmarks can seem confusing at first glance. A collection of tiny numbers, letters, and symbols hidden inside a ring or clasp does not exactly scream “easy to understand.” The good news is that once you know what to look for, reading hallmarks becomes simple.

This guide breaks down everything you need to know when buying secondhand gold jewellery.

What Is a Hallmark?

A hallmark is an official stamp applied to precious metals such as gold, silver, platinum, and palladium. In the UK, hallmarking is a legal requirement for most gold jewellery above a certain weight.

Hallmarks help protect buyers by confirming:

·         The metal is genuine

·         The purity of the gold

·         The jewellery has been independently tested

·         The piece meets legal standards

When buying secondhand fine jewellery, hallmarks provide reassurance that you are investing in authentic precious metal rather than plated or imitation pieces.

Where Are Hallmarks Found?

Hallmarks are usually stamped in discreet places on the jewellery.

Common locations include:

·         Inside ring bands

·         On bracelet clasps

·         Near necklace fastenings

·         On earring posts or backs

·         On pendants near the bail

Older or vintage pieces may have slightly worn hallmarks due to age and years of wear.

Understanding Gold Purity Marks

The most common hallmark you will see is the gold purity mark.

This number tells you how much pure gold is contained within the alloy.

Common Gold Hallmarks

Gold Purity	Hallmark Number	Gold Percentage
9ct Gold	375	37.5% gold
14ct Gold	585	58.5% gold
18ct Gold	750	75% gold
22ct Gold	916	91.6% gold
24ct Gold	999	99.9% gold

For example:

·         A ring stamped “375” means it is 9ct gold

·         A bracelet stamped “750” means it is 18ct gold

These numbers are often much more reliable than older carat markings alone, making them important when buying secondhand gold jewellery online or in store.

What Do the Other Symbols Mean?

UK hallmarks can contain several additional symbols.

The Assay Office Mark

This symbol shows where the jewellery was tested and hallmarked.

The four UK assay offices are:

Assay Office	Symbol
London	Leopard Head
Birmingham	Anchor
Sheffield	Rose
Edinburgh	Castle

These marks are especially useful when identifying vintage and antique jewellery.

Sponsor or Maker’s Mark

This is usually a set of initials identifying the maker, designer, or company responsible for submitting the jewellery for hallmarking.

For collectors and designer jewellery buyers, these marks can sometimes help identify:

·         Luxury brands

·         Vintage manufacturers

·         Independent jewellers

·         Historic makers

Date Letters

Some older British jewellery also contains a date letter.

Each year is assigned a different font and letter style, allowing experts to estimate when the piece was hallmarked.

Date letters are commonly found on:

·         Antique gold jewellery

·         Vintage signet rings

·         Estate jewellery

·         Older designer pieces

Why Hallmarks Matter When Buying Secondhand Jewellery

Hallmarks are particularly important in the secondhand jewellery market.

They help buyers:

Verify Authenticity

A genuine hallmark confirms the metal has been officially tested.

Understand Value

Gold purity directly impacts a jewellery item’s intrinsic value.

For example:

·         18ct gold contains more pure gold than 9ct gold

·         Higher purity gold is generally softer and more valuable

Buy With Confidence

Hallmarks provide transparency and reassurance, especially when purchasing pre-owned or vintage jewellery online.

Can Hallmarks Wear Away?

Yes. Over time, hallmarks can become faint due to polishing, resizing, or everyday wear.

This is particularly common on:

·         Vintage rings

·         Antique bangles

·         Frequently worn chains

Even if a hallmark is partially worn, experienced jewellers can often still identify the metal through testing.

Are All Gold Pieces Hallmarked?

Not always.

Very lightweight pieces may legally fall below hallmarking thresholds.

Some antique jewellery may also pre-date modern hallmarking regulations or originate from countries with different hallmark systems.

If a piece is not hallmarked, a reputable jeweller should still be able to test and verify the metal.

Tips for Buying Secondhand Fine Jewellery

When shopping for secondhand gold jewellery:

·         Always check for a hallmark where possible

·         Buy from trusted jewellers and reputable sellers

·         Ask questions about gold purity and authenticity

·         Request close-up photos of hallmarks when buying online

·         Be cautious of unusually low prices on supposedly high-value gold pieces

A hallmark is one of the simplest ways to confirm you are purchasing genuine precious metal when buying secondhand fine jewellery.

Final Thoughts

Understanding hallmarks does not require expert knowledge. Once you know the basics, these tiny symbols become incredibly useful when shopping for secondhand fine jewellery.

Whether you are buying a vintage chain, a designer bracelet, or an everyday gold ring, hallmarks help you understand exactly what you are purchasing.

At Secondhand Jewellery by Hatton Garden Metals, transparency and authenticity are at the heart of every piece we offer. Every item is carefully checked to ensure customers can shop with confidence and enjoy giving beautiful jewellery a second life.