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Hallmarking

925 Sterling Silver and Hallmarked Gold

925 Sterling Silver
925 Sterling Silver is a metal alloy, made from a combination of metals. This is because pure silver is naturally soft and therefore not hard enough to use in jewellery. The jewellery is made from 92.5% silver, and 7.5% from alloy, typically zinc or copper. Mixing the metals gives it strength and increases the lifespan of jewellery. In the UK it is a legal standard that any silver jewellery over 7 grams must be Hallmarked with the 925 stamp.


9ct Hallmarked Gold
9ct Hallmarked Gold contains 37.5% pure gold and 62.5% alloys, hence ‘375’ stamped (Hallmarked) on the gold. It is tough and highly durable, with a softer gold colour which some people prefer. Interestingly, 9ct gold was popularised during the war, as a more affordable option for wedding rings.


18ct Hallmarked Gold
18ct Hallmarked Gold contains 75% pure gold and 25% alloys, hence ‘750’ stamped (Hallmarked) on the gold. Due to the higher gold content, 18ct Gold has a much richer gold colour compared to 9ct Gold.


What is Hallmarking?
A Hallmark is an official seal of quality which is marked on jewellery. It’s a legal requirement which certifies the purity of silver, gold or platinum. This is useful for buyers as they know what quality they are getting. All precious metals can be Hallmarked, as long as they meet the legal standards of weight.

For silver, you can have an item of jewellery that’s up to 7g (quite heavy) that doesn’t need to be hallmarked. This is due to the high cost of Hallmarking, meaning it is not commercially viable on smaller pieces of silver jewellery.


Gold only needs to be 1g+ to need Hallmarking. However, I ensure all my gold jewellery both over and under 1g, comes with a Hallmark

How to guarantee your Hallmark

Full British Hallmark

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