A Guide
to Hallmarking

We know that when it comes to buying jewellery you want to be
confident in what you’re buying.

We’ve created a jewellery hallmarking guide to help you understand silver, gold, platinum and palladium hallmarks, the markings Beaverbrooks use and why we fully support the British hallmarking system.


What is a hallmark?

Gold, silver, platinum and palladium are rarely used in their purest form when it comes to jewellery due to their softness. Instead they’re alloyed (mixed) with other metals to achieve the desired strength, durability and colour. A hallmark is used to identify the purity of these precious metals.

Around for hundreds of years, hallmarks are a reassurance of the precious metal quality and purity – giving you confidence in what you are buying. They are a legal requirement in the UK. Hallmarks must be present at the point of sale, subject to the following weight exemptions:



mandatory for items above 7.78 grams



mandatory for items above 1 gram



mandatory for items above 1 gram



mandatory for items above 0.5 grams


How to read hallmark symbols

Made up of three compulsory marks, a hallmark is usually on the back or inside of your jewellery. A special magnify, called a loupe, is needed most of the time as they can be quite small and hard to read without. We recommend using a 10x loupe.


Traditional Marks & Date Letters

You might discover a couple more jewellery markings alongside the compulsory ones. These are optional and known as the Traditional Marks (similar to the Standard Mark, these are symbols to show the precious metal instead of numbers), and the Date Letter (the year in which the precious metal was hallmarked).

Commemorative Marks

These are special marks which are created to celebrate a major event. This year, Her Majesty The Queen will become the first British Monarch to celebrate a Platinum Jubilee and to commemorate the 70th anniversary, the British Hallmarking Council has sanctioned a commemorative mark designed by Thomas Fattorini Ltd.


Beaverbrooks | Birmingham Assay Office Logos

Beaverbrooks Hallmarking

Here at Beaverbrooks, we fully support the British hallmarking system. As mentioned previously, we’re registered with the Birmingham Assay Office meaning all of our precious metal jewellery is compliant with the UK’s hallmarking regulations. For any items that are below the UK Hallmarking Act’s mandatory weight for hallmarking, we do voluntary testing to ensure the items meet the minimum fineness requirement.


What is an Assay Office?

An Assay Office is the place in which precious metals get tested and hallmarked before sale, however they’re not just used for this. The Birmingham Assay Office is also the home to the AnchorCert Analytical Laboratory, SafeGuard Valuations and the AnchorCert Gem Lab.


  • What does hallmark mean?

    The item has been tested and certified by one of the Assay Offices and legal to be sold as gold, silver, palladium or platinum.

  • What hallmark is 925?

    This is the hallmark for sterling silver.

  • What is the hallmark for silver?

    When it comes to identifying silver hallmarks, depending on the purity of the silver, the stamp can range from 800 to 999. The most common silver for jewellery is sterling silver which identifies as 925.

  • What is the hallmark for gold?

    Again, depending on the purity of the gold, the hallmark changes. The most common gold purities found in jewellery are 9ct gold and 18ct gold, both of which show a different stamp allowing you to differentiate the two. For 9ct you will see 375 and for 18ct you will see 750. Other gold hallmarks are 585 (14ct), 916 (22ct), 990 (24ct) and 999 which is fine gold.

  • What is the hallmark for white gold?

    Gold, white gold and rose gold all use the same hallmark as they all start off as fine gold and are mixed with alloys (other metals) to reach their desired colour and strength. For example, white gold is mixed with silver-coloured alloys and coated with rhodium in order to create that bright white finish, whereas yellow gold is mixed with similar coloured alloys to keep the yellow gold look.

  • What is the hallmark for platinum?

    The most popular fineness for platinum jewellery is 950 however, don’t get this confused with palladium as they both use the same fineness. For platinum you will find the 950 within a trapezium shape whereas for palladium the 950 is situated within a bubble.

  • How to tell if something is silver without a hallmark

    It is the law that all silver sold in the UK must have a hallmark, unless it weighs below 7.78 grams. If it doesn’t have a hallmark and it is above the mandatory weight, there is a chance it isn’t silver. You can send your jewellery pieces to one of the Assay Offices and get your item tested and valued to find out the full metal content.


Dealers Notice

This is a notice that explains the current and approved hallmarks and is produced by the British Hallmarking Council. The Hallmarking Act 1973 made it a requirement for all places that sell precious metal jewellery to have it on display.