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What is a Hallmark?

A hallmark:

  • Is a set of component marks applied to articles of the precious metals gold, silver, platinum or palladium.
  • Means that the article has been independently tested.
  • Guarantees that it conforms to all legal standards of purity (fineness).
  • Guarantees provenance by telling us where the piece was hallmarked, what the article is made from, and who sent the article for hallmarking. 

The standard hallmark formation is horizontal with minimal spacing between the marks.  

Other formations of these hallmarks, often called "bespoke" or "display marks" are available.


We apply the Full Traditional UK Hallmark as standard.

The Full Traditional Hallmark comprises five marks:

  • Sponsor's mark - compulsory
  • Traditional fineness mark
  • Millesimal fineness mark - compulsory
  • Assay Office mark - compulsory
  • Date letter mark 

Unless otherwise stated this is the standard mark we apply.



Hallmarking Key
  • Traditional UK Hallmark

    Traditional UK Hallmark

  • Minimum Compulsory UK Hallmark

    Minimum Compulsory UK Hallmark

  • International Convention Hallmark

    International Convention Hallmark

  • Tradtional UK Hallmark plus CCM

    Tradtional UK Hallmark plus CCM

What do the symbols of the Full UK Hallmark represent?

Sponsor's Mark

(Also known as Maker's Mark.) Compulsory mark. This is the registered mark of the company or person that submitted the article for hallmarking. It comprises of the initials chosen by that person or company inside a surrounding shield shape. The shield shape varies, and a minimum of two, and maximum of five initials must be included.

Every one is unique. 

When you register with us, you join a legacy of makers stretching back centuries. Register here.


Maker JPG

LAO stands for London Assay Office

Traditional Fineness Symbol

The traditional fineness symbol is an optional part of the hallmark but applied as standard at the Goldsmiths' Company Assay Office.

Left to right: Sterling silver, Britannia silver, gold, palladium, platinum

Millesimal Fineness Mark

Compulsory mark. This mark tells you how fine, or what quality, the metal is, as well as indicating the metal type. This numerical format was made compulsory in 1999 and shows the precious metal content of the article, expressed in parts per thousand.  We mark a piece to the lowest standard of precious metal, so it guarantees that the quality of the whole article is no less than the fineness indicated. 

The shape of the surrounding shield indicates metal type. 

Fineness marks recognised in the UK

Assay Office Mark

Compulsory mark. This mark tells you which Assay Office tested and hallmarked the article. 

The historic image of the leopard’s head, the town mark for London, and the mark of the Goldsmiths’ Company Assay Office, continues to be internationally recognised as the stamp of approval and guarantee of quality from the renowned home of hallmarking. 

The leopard's head mark of London has been used by some of the finest craftsmen in history, on some of the most prestigious and celebrated works. 

Read more about our History & Heritage here, the history of the Goldsmiths' Company here and more about the history of Goldsmiths' Hall here

Assay Logos

Left to right: London, Birmingham, Sheffield, Edinburgh.

Date Letter Mark

 non-compulsory mark, the date letter changes annually on January 1st. The font, case, and shield shape all change so each can only indicate one specific year.  All date punches are destroyed at the end of the year.

Date Letters in Order

Date Letters: 2019-2024

Mixed Metal Items

Items are allowed to be made of more than one metal.

Part Marks

Additional marks can be applied to signify the various metals which make up the item.

For more information on the rules of applying mixed metal marks please visit our Mixed Metals page.

We also offer bespoke formations of hallmarks known as Display Marks or Feature Marks.

Display/bespoke marks can be used as a proud feature to complement the item's design.  These cost extra to apply due to the time to plot the hallmarks, and mark the article.  Our Standard Price List is available in the downloads section here stating the surcharge for these types of marks.

Hallmarks which are spaced, in a different formation other than straight and together, above 0.75mm in height on a ring, or 1.5mm or above in height on any other article are considered bespoke and display/feature marks incurring a surcharge.

Scroll through the carousel below for hallmarking arrangements.

  • Hexagonal spot

    Hexagonal spot

  • Hexagonal staggered spot

    Hexagonal staggered spot

  • Pentagonal spot

    Pentagonal spot

  • Pentagonal staggered spot

    Pentagonal staggered spot

  • Rotating hexagonal spot

    Rotating hexagonal spot

  • Rotating pentagonal spot

    Rotating pentagonal spot

  • Spaced mark

    Spaced mark

  • Spot staggered

    Spot staggered

  • Staggered


  • Up and down staggered

    Up and down staggered

  • Vertical


  • Standard


  • Spot Mark No. 1 - Cross

    Spot Mark No. 1 - Cross

  • Spot Mark No. 2 - Square

    Spot Mark No. 2 - Square

  • Vertical Staggered

    Vertical Staggered

Commemorative Marks

Historically, commemorative marks have been added to the regular hallmark to mark special events as shown below.

1935 Silver Jubilee

1977 Silver Jubilee

2002 Golden Jubilee

1953 Coronation Mark

2000 Millennium Mark

2012 Diamond Jubilee

Common Control and Convention Marks

The Convention on the Control and Marking of Articles of Precious Metals (known as the Hallmarking Convention) is an international treaty between Contracting States.

The Convention Hallmark can be applied to an item allowing it to be sold between countries who are members of the Convention, negating the need to go through the Assay process again.

More information on Convention and its Hallmarks can be found here. 


Left to Right: Sterling Silver/Palladium 950/18ct Gold/Platinum 950/ Type 2 CCM, to be used in conjunction with Millesimal Fineness mark

A Convention Hallmark comprises four marks:

  • Sponsor's mark
  • Common Control mark
  • Millesimal fineness mark
  • Assay Office mark

Finenesses recognised under the Convention are:

  • Gold - 375, 585, 750, 916, 999.
  • Silver - 800, 925, 999.
  • Platinum - 850, 900, 950, 999.
  • Palladium 500, 950 and 999

Example of silver convention mark