British Hallmark Guide

What is a Hallmark?

A hallmark is a quality control mark placed on an article made of precious metal to indicate the purity of the metal, also known as an assay or standard mark. There may also be other marks alongside the hallmark such as the makers mark and the assay office

UK hallmark symbols give the following information:

  • who made the article (makers mark)
  • what is its guaranteed standard of fineness (purity)
  • The Assay Office at which the article was tested and marked
  • The year in which the article was tested and marked
hallmark
gold 750
hallmark
j

AB Sponsor

or maker

Standard

Mark

Assay Office

Mark

2008

Sponsor’s Mark or makers mark

This shows the person or company responsible for sending the article to the Assay Office. The sponsor may be the manufacturer, retailer, importer, for example.

Standard Mark

This shows the standard of fineness – the purity of the precious metal, in parts per thousand.

eg:
silver 925 750
The background shape shows the metal (silver).

The figure shows the article consists of 925 parts of silver by weight to 75 parts of other metals – i.e 92.5% Silver.

Current Gold Standards

gold 375
gold 585
gold 750
gold 916
gold 990
gold 990

9 carat

37.5% Gold

14 carat

58.5% Gold

18 carat

75% Gold

22 carat

91.6% Gold

Current Silver Standards

silver 800
silver 925
standard mark 958
silver 999

Sterling

92.5% Silver

Britannia

95.8% Silver

Current Platinum Standards

platinum
platinum 900
platinum 950
platinum 999

Assay Office Mark

This indicates which assay office the article was hallmarked by

hallmark
hallmark london
hallmark edinburgh
hallmark sheffield
Birmingham
London
Edinburgh
Sheffield

Metals Such as Titanium and Tungsten Carbide are not considered to be precious metals and therefore are not required to be hallmarked