Hallmarking in the UK

A hallmark is a set of official marks struck on items made of precious metals like gold, silver, platinum, or palladium, typically by an Assay Office. These marks guarantee the metal's purity and offer a form of consumer protection. In a broader sense, a hallmark can refer to any distinguishing characteristic or feature. 

An informative poster explaining hallmark stamps for precious metals, showing examples of rings and bars with the hallmark symbols and their meanings, including four UK assay office symbols and international hallmark standards.