A hallmark is a mark or series of marks struck on items made of precious metals — platinum, gold, silver and in some nations, palladium.

Hallmarks Defined

A hallmark, is an official mark or series of marks struck on items made of precious metals — platinum, gold, silver and in some nations, palladium. In a more general sense, the term hallmark can also be used refer to any distinguishing characteristic or trait.

Historically, hallmarks were applied by a trusted party: the 'guardians of the craft' or nowadays by an assay office. Hallmarks are a guarantee of certain purity or fineness of the metal as determined by formal metal (assay) testing.

Hallmarks Distinguished from Other Marks

Hallmarks are often confused with "trademarks" or "maker's mark". Hallmarks are an official mark of guaranteed metal content, trademarks are the mark of the party responsible for making the item.

Simple number marks such as 750 or 925 (albeit intended to denote the fineness of the metal) also are not to be confused as being a hallmark unless accompanied with an official country hallmark as described by the country's hallmarking methodology. Simple number marks are often struck into the metal by the manufacturer, and unfortunately may not always reflect the true purity of the compound metal.

Pre-requisites to Hallmarking

Notwithstanding the hallmarking systems of many nations require, as a prerequisite to official hallmarking, that the maker or sponsor itself mark upon the item a responsibility mark and a claim of fineness. Responsibility marks are also required in the U.S. if metal fineness is claimed despite the fact that there is no official hallmarking scheme in that country. Nevertheless, in nations with an official hallmarking scheme, the hallmark is only applied after the item has been assayed to determine that its purity conforms not only to the standards set down by the law but also and with the maker's claims as to metallurgical content.

Systems Differ from Nation to Nation

In some nations, such as the UK, the hallmark is made up of several elements including: a mark denoting the type of metal, the maker/sponsor's mark and the year of the marking. In other nations, such as Poland, the hallmark is a single mark indicating metal and fineness, augmented by a responsibility mark (known as a sponsor's mark in the UK). Among a group of nations which are signatories to an international convention known as the Vienna Convention, additional, optional, yet official marks may also be struck by the assay office. These have the effect of easing import obligations among and between the member states. Signatory countries have a single representative hallmark which would be struck next to the Convention mark which represents the metal and fineness. =

Ancient Byzantine Hallmarks

Hallmarking in the Late Middle Ages