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Importance of Hallmarking
of Precious Metals

Creating handcrafted pieces in precious metals requires varying initial processes. We use precious metals not in their purest form but blend with varying other types of metals to create colour, strength and affordability. As these metals are mixed and adjusted, hallmarking by an assaying office becomes vital in determining that the percentage of platinum, palladium, gold or silver etc. is current within the piece being offered for sale.

Compulsory Three Hallmark Layout

These three marks shown are compulsory legal hallmarks that are required to sell any piece of precious metal here in the UK. A full UK hallmark tells you who made the item, what precious metal it is made of and where and when it was hallmarked. These are examples and can be applied in numerous ways. The makers mark is relevant to who submitted the article for hallmarking and his or her registration initials. The purity mark is relevant to the type of precious metal submitted and its purity parts out of 1000. The final mark is the symbol representing which assay office tested and hallmarked that item.

Makers mark
Platinum 950 purity mark
London assay office mark

Optional Five Hallmark Layout

Images below shows typical five hallmarks layout stamped on an item made, as an example from a piece of sterling silver. The traditional fineness mark (lion) and the date letter (W) are optional marks. As mentioned above the other three shown are compulsory marks. Marks listed from left to right are as follows: London Assay Office, Lion Passant (optional mark), 925 Sterling Silver, Date Letter (optional mark) and Makers Sponsor's Mark. Remember these hallmarks can vary depending upon precious metal type, year, maker and assay office applying the hallmarks.

London assay office leopards head hallmark
Sterling silver fineness assay mark
Sterling silver 925 assay mark
Assay date letter mark changed annually on 1st January
Assay sponsor's mark or makers mark

Assay Marks & Offices

There are five remaining assay offices left in England and Ireland, these are London, Birmingham, Sheffield, Edinburgh and Dublin. Our Tarvier sponsor's mark "CRA" is registered with London Assay Office. This hallmark is struck or lasered on all our handmade work submitted to London Assay Office for testing and hallmarking.

Assay Offices Closed
  • York Assay (closed 1858)
  • Exeter Assay (closed 1883)
  • Chester Assay (closed 1962)
  • Glasgow Assay (closed 1964)
  • Norwich Assay (closed 1702)
  • Newcastle Assay (closed 1884)
Assay Offices Open
  • London Assay Office
  • Dublin Assay Office
  • Sheffield Assay Office
  • Edinburgh Assay Office
  • Birmingham Assay Office

Assay Office Hallmarks

Every assay office has or had their own unique hallmark to represent their office. Hallmarks below show the current open assay office hallmarks and their unique stamp profiles that are marked on precious metals. This is a compulsory mark will be found on all submitted articles that meet the testing guidelines. All our handmade work is submitted to London assay office and carry's the profile of the leopards head.
In order:
London, Birmingham, Sheffield, Edinburgh & Dublin Assay Office Hallmarks'

London assay office hallmark depicting the leopards head
Birmingham assay office mark of the anchor
Sheffield assay office mark depicting the Yorksire Rose
Edinburgh assay office mark depicting the three towered castle
Dublin assay office hallmark of Hibernia

Assaying Office Mark

Hallmarking by a registered assay office of precious metals such as silver, gold, palladium & platinum is required by UK law when producing an item for sale. The hallmarks stamped or lasered in relation to metal type on an article represent a chemical analysis of the metal composition. The symbol that denotes this is referenced by a pacific shape surrounding a set of numbers. The shape depicting the type of metal, the number clarifying the parts out of 1000 in relation to its purity.

Hallmarks are made up of five individual marks in today's structure. Three marks are compulsory with two an option when submitting your items to be assayed. We generally have all five traditional marks allocated to our work by London assay office.

Compulsory Marks
  • Sponsor's mark
  • Assay Office Mark
  • Metal & Purity Mark (Fineness Mark)
Optional Marks
  • Date Letter
  • Traditional Fineness Symbol
CRA sponsor's assay mark registered at Goldsmths' Hall, London

CRA Makers Mark (Sponsor's Mark)

As a silversmith or jeweller manufacturing articles for sale we must have our work tested by law over a certain weight. Our registered assay office is The Goldsmiths' Company Assay Office London. To identify our work we have our personal initial stamp struck alongside a metal purity mark and the Goldsmiths'leopards head mark. The initial mark that represents our work is "CRA". Our initial is encased in a shield design with a pacific font style as shown above. Shield designs along with font styles vary to separate makers with the same initials. Because of this process we can identify hallmarks dating back hundreds of years and know who the maker was.

Fineness purity mark for sterling silver 925

Metal & Purity Mark (Fineness Mark)

The first introduction in England for purity standards governing gold and silver started back around year 1300. This set standards of metal purity, results of purity had to be equal to or above limits set by the government. If we take silver as an example, silver can be marked as 925. This evaluates to 925 parts out of 1000, pure silver being 1000 parts. 925 is known as Sterling Silver. purity can been seen in a lower value such as 800 or a higher value 958 which is known as Britannia Silver and finally as 999 denoted as Fine Silver.

London assay date letter for 2021

Date Hallmark

Date of hallmarking is represented by ordered letters of the alphabet with varying font styles, lower and uppercase, encased with varying shield designs. Part or all of the alphabet is used to distinguish the year of hallmarking. Occasionally a letter is omitted within the order but this is logged as not to confuse the year of hallmarking.
Assay offices use a different year letter to represent the same year. For instance, London assay office used the letter A for 1816, Birmingham used letter S for the same year. Some assay offices had letters in disorder which were rotated differently to determine the year. The process was and is to create separation in identifying hallmarks. Since the introduction of hallmarking this system has helped date items dating back 700 years. The above date letter W represents London 2021.

Traditional fineness symbol for sterling silver 925

Traditional Fineness Symbol

This is a range of visual optional marks that are applied alongside the purity mark to clarify the precious metal type. In silver three varying symbols tell us the purity of the silver as well as clarifying that the item is silver. Three others tell us that the item is either gold, palladium or platinum. The mark above of the lion passant tells us that the item is made from 925 sterling silver.

Duty & Commemorative Hallmarks

Along with the standard marks others can be seen from previous decades and centuries. These include purity assay symbols marks, commemorative assay marks and with silver antiques, duty marks can be found depending on the period in history.

In 1784 the duty mark was created as a punch to show the tax on the item had been paid to the crown, this was portrayed by the assay mark depicting the profile portrait of the reigning monarch's head. The Duty mark was abolished in 1890 during the reign of Queen Victoria.
There was an additional British Hallmark during the 18th Century, the tally mark. This was added so a journeyman could mark how many pieces he had been made under his or her hand, so that when he finished his apprenticeship he or she could be paid correctly.

If you submitted work for assaying during the years of the Queen's Coronation or the Queen's Jubilee, your work would have been marked with a commemorative hallmark.
Below are three commemorative hallmarks from the 20th century, Silver Jubilee hallmarks of 1935 and 1977 with the Queen's Coronation hallmark of 1953.

Silver jubilee commemorative hallmark 1935
Queens coronation hallmark 1953
Queens silver jubilee hallmark 1977

Identification of Silver Hallmarks

We recommend Jackson's Hallmarks Pocket Edition book as a good bases for the identification of assay hallmarks. Detailed entries are listed from 1300 to the present day. This will give you a good bases for identifying silver with regards silversmiths, assay offices and dating your silver and gold.


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