All precious metals supplied in the UK must be hallmarked to prove they are as sold.

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Hallmarks are legal markings stamped into precious metals by the British Assay Office. They denote the purity of the precious metal, as well as the origin of the item. Hallmarks are essential for proving the inherent value of your jewellery. You should never purchase a piece of fine jewellery without a hallmark, unless in rare cases that the piece is under the weight requirements for Assay.

What Makes up a Hallmark?

Up until 1998, hallmarks were made up of four “compulsory marks”. The date mark has since become optional but the other three symbols remain compulsory. The compulsory symbols represent:

  • who made the item
  • the guaranteed level of purity
  • the Assay Office at which the article was tested and marked

What do Hallmarks Look Like?

There are three compulsory marks that make up a modern hallmark. The first represents the alloy the item is made from. There are different shaped marks for gold, silver, platinum, and palladium. Each unique shape also contains a number which shows the purity of the alloy.

Gold mark in the hallmarks

Gold hallmarks are shaped like an elongated octagon. They are the same regardless of whether the gold is yellow, white, or rose.

Silver mark in a hallmark

Silver hallmarks are oval. The most common silver you will come across is 925 sterling silver.

Platinum mark in a hallmark

Platinum hallmarks are shaped like a pentagon. The most common platinum alloy in jewellery is 950.


Modern palladium hallmarks are shaped like three ovals joined together. The most common palladium alloy you will find in UK jewellery is 950.

Marks from the different offices

The next mark which makes up the hallmark is the Assay Office mark. There are four Assay Offices in the United Kingdom, located in London, Edinburgh, Sheffield, and Birmingham.

The final compulsory mark is the maker's mark. This might be a mark unique to the jeweller you have purchased the item from, but it could also be the mark of the casting workshop who initially cast the piece.

The majority of our rings are hallmarked by the Birmingham Assay Office, so will feature the anchor mark. However, we can hallmark your item in the London Assay office (Goldsmiths' Hall) or Sheffield office by request. Please note that there will be an additional cost for this service.

A small number of our two-metal rings are finished in Austria. These only feature a fineness mark due to different regulations across countries.

Optional Metal Marks

There are a number of optional metal marks that can be added to a piece of jewellery upon request. These include the year stamp, commemorative marks, duty marks, or additional standard marks.

The date stamp is usually a single letter. These are made distinct year on year by its background shape, font, and whether the letter is upper or lower case.

Commemorative marks are released by the Assay office to commemorate events. Examples of this include the Millennium mark, or the Jubilee marks.

Duty marks indicate that an item has been sold during a time when a duty was placed on gold or silver by the crown.

Additional standard marks are the alternative marks which denote the metal the piece of jewellery is made from. These are less commonly applied to new jewellery, and are not legally required.