9ct Gold — The UK's Everyday Jewellery Standard
9 carat gold (375) is only 37.5% pure gold, alloyed heavily with copper, silver and other metals — the legal minimum that can still be called "gold" in the UK. That lower gold content makes it the most affordable and scratch-resistant option, which is exactly why it dominates UK high-street jewellery: signet rings, chains, earrings and everyday pieces from most British retailers are 9ct unless stated otherwise.
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24 Carat (24k)
Hallmark 999
22 Carat (22k)
Hallmark 916
21 Carat (21k)
Hallmark 875
18 Carat (18k)
Hallmark 750
14 Carat (14k)
Hallmark 585
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Frequently Asked Questions
375 indicates 37.5% pure gold by weight — the standard hallmark for 9 carat gold, the UK's legal minimum and most common jewellery purity.
9 carat gold is the cheapest legally-recognised gold purity in the UK and the most durable against everyday scratches and knocks, which is why the majority of UK high-street jewellery — rings, chains, earrings — is sold at this purity.