Hallmarking refers to the independent verification of the precious metal content. All of the products coming from the Beth Legg Studio are verified independently by the Assay office in Edinburgh. This is done through the 700 year old practice of hallmarking and a hallmark is only applied after the item has been assayed to determine that its purity conforms to both legal standards and metallurgical content.

The 1973 Hallmarking Act stipulates that all silver articles weighing more than 7.78 grams must be hallmarked in order to be described as such. Articles below this exemption weight may be described as silver without the need for a hallmark.

All pieces listed as 18ct Yellow Gold are hallmarked as solid gold and are not plated.