Look for the Hallmark, it’s your guarantee
In the UK it is illegal to supply or offer to supply any item as gold, silver, platinum or palladium unless it is hallmarked.
Exemption weights apply:
silver - 7.78 grams
gold and palladium - 1 gram
platinum - 0.5 grams
Who?
The registered mark of the company or individual who placed the items on the market.
What?
The precious metal content in parts per thousand inside a specific shape for each metal:
gold - 750 parts per thousand
silver - 925 parts per thousand
platinum - 950 parts per thousand
palladium - 950 parts per thousand
Where?
Each of the 4 UK Assay offices (Birmingham, Edinburgh, London and Sheffield) has a separate mark.
International
International hallmarks must contain the scales of the Common Control Mark