What is a Hallmark?

A hallmark is a guarantee of the precious metal content in a piece of jewellery. Jewellery made out of silver, palladium, gold, and platinum is required to be hallmarked.

Types of Hallmark?

A hallmark consists of a Sponsor’s Mark, Fineness Mark and Assay Office Mark 1. A Sponsor’s Mark is the registered mark of the company that submits the jewellery item for hallmarking.

2. A Fineness mark

It provides information about precious metal content. This is expressed in parts per thousand. For example, 18 carat gold is marked as 750 while 14 carat gold is marked as 585.

3. The Assay Office Mark

Tells which Assay Office tested and hallmarked the article. In the UK, the four Assay Offices are located in London, Birmingham, Sheffield, and Edinburgh.