Silver, 925 and UK hallmarks

“925”, “silver” and “silver plated” do not all mean the same thing. Read the complete description, then look for the evidence appropriate to the claim.

What 925 describes

Sterling silver has a fineness of 925 parts silver per thousand, commonly expressed as 92.5%. It is an alloy, rather than pure silver. A silver-coloured surface may instead be a coating or a different metal entirely.

A number stamped on a piece is not, by itself, a complete UK hallmark. Nor does a product photograph let this publication authenticate the metal. A useful first step is to ask the seller to describe the main metal and any surface coating separately.

Read a hallmark as a set

The British Hallmarking Council’s practical guidance identifies three compulsory components of a UK hallmark: the sponsor’s mark, a metal/fineness mark and an assay-office mark. A date letter is optional.

The Goldsmiths’ Company Assay Office explains that a sponsor is the person or organisation responsible for submitting an article, which is not necessarily its manufacturer. The assay-office mark identifies where it was tested and hallmarked; do not read it as proof of the country where the jewellery was made.

Understand the weight exemptions

General UK minimum weight thresholds are 7.78 g for silver, 1 g for gold, 0.5 g for platinum and 1 g for palladium. Items below the relevant threshold can be exempt from compulsory hallmarking. Other exemptions and recognised international marks can apply, so use the official guidance for a particular case.

The absence of a full hallmark on a small charm is therefore not enough to declare it fake. Equally, a “925” stamp alone is not independent proof that a claim is correct.

Questions worth asking

• Is the item solid sterling silver, silver plated, or another material with a silver-coloured finish?
• Is the visible surface bare silver, rhodium plated, gold plated or deliberately oxidised?
• What is the stated weight, and does the seller distinguish metal weight from the assembled item?
• Can the seller provide a clear photograph of the marks and explain any claimed exemption?
• Are the clasp, attachments and decorative inserts described separately where they differ?

Keep a copy of the description with the receipt. If two listings use different terms, do not assume the cheaper one is offering the same construction.

What a hallmark does not answer

A hallmark relates to precious-metal fineness. It does not tell you whether a charm fits a bracelet, whether a clasp is easy for you to use, or whether the design is appropriate for a person with a particular material sensitivity. It is one piece of evidence, used for a specific purpose.

For a coated piece, continue to plated jewellery. For care, first identify all the materials in the item and use the care decision guide.