Home About Us Services Library & Silver Collection Testimonials Resources Latest News & Press Contact Us Experts in Hallmarking The oldest form of consumer protection, the history of the hallmark dates back as far as 1300... » Find out more... Hallmarking » In an age where consumer protection and rights are a key concern for most present-day manufacturers it is fascinating to note that the hallmark is, in fact, one of the oldest forms of consumer protection that exists. The history of the hallmark dates back as far as 1300. » More about Hallmarking Analytical Services » We offer a range of additional analytical services from metal and mineral analysis, to mercury screening and environmental testing. Sheffield Assay Office was the first UK Assay Office to be awarded UKAS accreditation and is proud to have retained that accreditation for 32 years. » More about Analytical Services Diamond Verification Services (DVS) » As the number of lab-grown diamonds in the market continues to soar, we recognised an urgent need for retailers, and consumers alike, to have access to a fully independent, specialist service that can accurately identify the presence of natural or lab-grown/synthetic diamonds. » More about DVS Latest News Assay Master Attends Sheffield Hallam University Graduation Ceremony 19th November 2021 Sheffield Makers Showcase Their Work 18th November 2021 The Goldsmiths' Craft & Design Council Competition 2021/22 17th November 2021 Early Hall Service To Be Reinstated 8th November 2021 » More News Home Privacy Policy Cookies Latest Covid Statement » Sheffield Assay Office, Guardians' Hall, Beulah Road, Hillsborough, Sheffield, S6 2AN • Tel: +44 (0)114 231 2121 © 2021 Sheffield Assay Office We are using cookies to give you the best experience on our site. Find out more.