5 minute read
What a hallmark actually guarantees
Britain has required hallmarking since 1300. It is the oldest form of consumer protection in the country, and most people wearing a hallmark have never been told what it says.
It is a legal requirement, not a maker's flourish
Under the Hallmarking Act 1973 it is an offence to describe an item as gold, silver, platinum or palladium in the course of trade without a UK hallmark, above the exemption weights. It is not a mark of quality applied by the maker. It is applied by an independent assay office that has physically tested the metal.
That independence is the entire point. The maker says what the metal is; the assay office proves it.
The weights below which it does not apply
Exemption weights exist because tiny items cannot be struck without damage. Silver is exempt below 7.78g, gold below 1g, platinum below 0.5g and palladium below 1g.
Almost every wedding ring is above these. A 4mm 9ct gold band at UK size N weighs around 3.6g, well past the 1g gold threshold, so it must be hallmarked.
Four assay offices, and how to tell them apart
Britain has four: London, Birmingham, Sheffield and Edinburgh. Each strikes its own town mark. Birmingham is an anchor, London a leopard's head, Sheffield a rose and Edinburgh a castle.
Birmingham's anchor is the one you will see most on British-made rings, because the Jewellery Quarter is there and its assay office is the busiest in the world by volume.
What the marks mean, in order
A full UK hallmark has three compulsory parts. The sponsor's mark identifies who submitted it. The fineness mark gives the metal purity as parts per thousand: 375 for 9ct gold, 750 for 18ct, 925 for sterling silver, 950 for platinum and palladium. The assay office mark says who tested it.
Two more are optional: the traditional fineness symbol and the date letter, which changes annually and is how a hallmarked ring can be dated exactly.
Why contemporary metals carry no hallmark
Titanium and zirconium are not precious metals, so the Hallmarking Act does not cover them and no assay office marks them. That is not a gap in the protection: there is nothing to protect against, because neither is alloyed with a cheaper metal the way gold is.
A ring combining both, such as a gold inlay in a titanium band, is hallmarked for the gold content only.
Mentioned: 9ct gold, 18ct gold, platinum 950, palladium 950, sterling silver.
