Birmingham Assay Office
"The majority of our rings are
hallmarked by the Birmingham Assay Office"

The majority of our rings are hallmarked by the Birmingham Assay Office for purposes of keeping to traditional British standards. Rings sold to the USA are not required to have a hallmark because there is no formal legislation on the matter.

In the UK, there are three compulsory hallmarks, and many other optional marks that you may find on your jewellery. Anything manufactured before 1998 will have a minimum of four marks, and anything made since then will have at least three (the date mark is now optional).

Each item will show a sponsor's (maker's) mark, a standard mark to show the metal and the mark of the Assay office which tested and stamped the metal.

compulsory hallmarks


Understanding British hallmarks

The main thing people look for in their hallmark is the Standard Mark – the mark which verifies the metal. This will contain a number encased in one of many different shapes. Both of these factors together tell you the metal. The Sponsor's Mark will be in the form of initials, and the mark of the Assay Office will be a symbol. Other symbols or letters can tell you more about the history of the item and the metal.

In the UK, rings or other items made from more than one metal must have the dominant metal stamped only. This sometimes means no hallmark at all, e.g. if the ring is ¾ titanium and ¼ platinum. As with all our jewellery, we are happy to hallmark this kind of ring by prior request.

Items under certain weights don't require hallmarks. Those weights are 0.5g for platinum, 1g for gold, and 7.78g for silver.


The Standard Mark

The number in the metal mark represents the standard of fineness, i.e. the purity of the precious metal in parts per thousand. To relate this to the carat, think of the carat as the parts out of 24. For example, 18ct gold is 18/24 gold, which is 750/1000, meaning it gets stamped with 750.

The background shape shows the metal. For example, if you look at the types of gold below, you'll see how they are all the same shape even though they are different purities.

Gold mark in the hallmarks


White gold, traditional yellow gold, and rose gold all have identical hallmarks, as each fineness level contains the same proportion of gold (the color difference comes from the other metals added to the alloy). The Assay office only test the proportion of gold rather than the other metals in the mix.

Silver fineness is shows inside an oval, showing one of four different standards. Sterling silver is 925, meaning it is 92.5% pure.

Silver mark in a hallmark


As with silver, there are four standards for platinum. The most popular in jewellery is the Platinum 950.

Platinum mark in a hallmark


Palladium is relatively new to the jewellery market, and its hallmark only became a legal requirement in 2010. Before that, it had an optional hallmark of a trapezoid - the compulsory mark is like three overlapping circles.

The Sponsor's Mark (Maker's Mark)

The Sponsor's Mark used to be known as the maker's mark, and shows the person or company responsible for sending the item to the Assay Office. The sponsor may be the manufacturer, retailer, or importer. The Sponsor's Mark is not necessarily the name of the company you bought the ring from - it could also be that of a workshop or supplier they use.

The mark of the Assay Office

There are now only four British Assay Offices, but there used to be more.

Marks from the different offices


The majority of our rings are hallmarked by the Birmingham Assay Office, although we can hallmark your item in the London Assay office (Goldsmiths' Hall) or Sheffield office should you wish.

Guide to optional metal marks

Optional hallmarks include the year, commemorative marks, duty marks or additional standard marks.

The year stamp is in the form of a single letter; distinct by its background shape, font, and whether it's upper or lower case.

Commemorative marks include such things as the millennium mark and the Queen's Jubilees.

Duty marks indicate that the item was stamped in a year when a duty was placed on gold or silver by the Crown.

Historically, marks have been added to show that an item was of foreign import.

Other standard marks than the simple number/shape combination have been in an out of fashion over the years. All metals have other marks that can be added to show what they are, e.g. palladium often has the stamp of the Pallas Athene. Stirling silver used to come come with a lion mark and gold with a crown or a sun icon.

More information

For more information about the properties of precious metals, have a look at our metals information pages to learn about the properties of the different hallmarked metals we offer.

If you're having diamonds in your ring, have a look through our pages on Buying Diamonds and Diamond Grading.

For more information about hallmarking, go to the UK Assay Office website, or contact us if you have any questions.

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