All gold and silver jewellery above a certain weight has to be independently hallmarked before it can be sold in the UK. Gold under 1g and silver under 7.78g can be sold without a hallmark.

 

All my jewellery is hallmarked by the Birmingham Assay office with the exception of jewellery weighing less than the legal requirements as mentioned above. Instead silver jewellery weighing less than 7.78g will be stamped with the 925 silver mark. My sponser mark is MJK.