Jewelry IdentifierWhat Does 9K Mean on Jewelry?
9K means 9-karat gold — 37.5% pure gold.
- Metal
- Gold
- Purity
- 37.5% pure gold
- Fineness
- 375/1000
- Karat / type
- 9K
- Also written as
- 375, 9ct, 0.375
- Commonly on
- UK jewelry, affordable rings, chains
A 9K stamp means 9-karat gold — 37.5% pure. It's a popular, budget-friendly gold standard in the UK and Commonwealth countries, though it sits below the US 10K minimum for being sold as gold. The number equivalent is 375.
What is a 9K piece worth?
9K holds modest melt value (~$36/gram at ~$3,000/oz); most of the piece is alloy, which makes it hard-wearing and cheap.
How to verify a 9K stamp
Scan the 9K stamp with the Hallmark Reader to confirm it's genuine and not plated. Anyone can stamp a mark on metal, so a hallmark alone isn't proof — the fastest way to check is to photograph the stamp and run it through the free Hallmark Reader, then confirm the metal itself with the Is It Real? tool. For a full picture of what your piece is worth, get a free jewelry appraisal. To compare 9K with every other mark side by side, see the full jewelry stamps and markings chart.
Frequently asked questions
Not sure what your jewelry really is?
Scan the stamp with the free Hallmark Reader, or get an instant value estimate — no sign-up needed.