In the UK it is illegal to sell or describe any item as Gold, Silver, Platinum or Palladium unless it is hallmarked. This only applies to weights as follows:

Silver - above 7.78 grams 

Palladium - above 1 gram

Gold - above 1 gram

Platinum - above 0.5 grams

Most of our jewellery is below these weights so does not need to be hallmarked.

Please see the information above from the British Hallmarking Council.