The importance of a Hallmark

When you buy a piece of precious-metal jewellery in the United Kingdom, one of the most important details to look for is the hallmark. More than just a series of tiny symbols stamped into a piece, a hallmark provides confidence about the metal you are buying and its purity.

A UK hallmark tells you the type of precious metal used and its fineness. For example, sterling silver is marked 925, while 18-carat gold is marked 750 and platinum is marked 950.  A hallmark can also tell a story. Alongside the fineness mark, you may find an Assay Office mark and a sponsor or maker's mark, identifying where the item was tested and who registered it. Older pieces may even carry historical hallmarks that can help establish their age and origin.

Hallmarking also plays an important role in protecting our consumers and sellers alike, especially in the world of pre-owned jewellery, as this gives the buyer confidence in the authenticity of the metal.  In the UK, certain precious-metal items above specified weight thresholds must be hallmarked by an authorised Assay Office eg: If a precious metal item weighs less than a certain amount it is not compulsory to apply a hallmark. The minimum weight thresholds are:

• gold 1 gram

• silver 7.78 grams

• platinum 0.5 gram

• palladium 1 gram

There are currently four main assay offices in the United Kingdom and they are located in London, Birmingham, Edinburgh and Sheffield.

For anyone buying or selling jewellery, understanding hallmarks is therefore invaluable. They provide trust, transparency and reassurance, ensuring that the precious metal in a piece is exactly what it claims to be.

So, next time you look at a piece of gold, silver or platinum jewellery, take a moment to find the hallmark — those tiny symbols can tell you a great deal about the piece in your hand.