A hallmark is a small official mark found on items made from precious metals to ensure their purity. In England, they date back over 700 years and act as a guarantee that your piece of jewellery is indeed pure. There are currently four Assay Offices in the UK which are Edinburgh, Sheffield, Birmingham, and London.
The hallmark is made up of three separate sections:
The Sponsor’s mark
For SEVEN London this will almost always be “SL”
The Standard mark
This represents purity of the precious metal, which for silver is 925
The Assay Office mark
This shows which assay office the piece was hallmarked in
By law, all items made of precious metals above a certain weight must be hallmarked if they are to be sold as Silver (7.78g), Gold (1.0g), Palladium (1.0g), or Platinum (0.5g). SEVEN London hallmarks all of our precious metal products, regardless of weight so that you, the consumer, can rest assured you are getting the finest jewellery.
A description of the various marks is illustrated below