General Hallmarking Guidance Information
The following information is from the Assay Offices of Great Britain who have guaranteed the quality of precious metals
Since 1327 – London Birmingham Sheffield Edinburgh.
Practical guidance in relation to the Hallmarking Act 1973
Items described as being made wholly or partly of gold, silver, platinum or palladium that is not covered under exempt articles.
The Main Exemptions:
Items below a certain weight are exempt from hallmarking. The exemption weight is based on the precious metal content only, excluding, for example, weight of diamonds, stones etc, except in the case of items consisting of precious metal and base metal in which case the exemption weight is based on the total metal weight:
Platinum 0.5 grams Gold 1.0 gram Palladium 1.0 gram Silver 7.78 grams
Any pre-1950 item may now be described and sold as precious metal without a hallmark, if the seller can prove that it is of minimum fineness and was manufactured before 1950.