Hallmark guide · Gold
What does 9K / 375 mean?
375 (37.5% gold) is 9 karat, the lowest UK gold fineness listed by Birmingham Assay Office and a 1972 Convention standard; it is also legal in Italy. The FTC Guides accept '9 Karat Gold' or '9 Kt.' marks.
- Metal
- Gold
- Purity
- 375/1000
- Where
- UK / Europe
01
Often confused with
- Low gold content: worth far less per gram than 14K or 18K.
- Below the old US 10K minimum, so less common on US-made pieces.
02
What a piece marked 9K / 375 is worth
Melt value $467.36. Likely cash offer $327.15 – $420.62.
37.5% pure gold62.5% silver, copper & zinc
Signed and designer pieces can sell for well above melt as whole jewelry. Check sold listings before you scrap them.
DocketYour tally
Add items to total everything you plan to sell, silver and gold together.
Sources
- Birmingham Assay Office - Gold Assay & Hallmarking
- Convention on the Control and Marking of Articles of Precious Metals (Vienna, 1972), English text in Tractatenblad 1991 nr. 16 (Netherlands official treaty series)
- Camera di Commercio di Caserta - Metalli preziosi (D.Lgs. 251/1999: identification mark and legal finenesses)
- 16 CFR Part 23 - FTC Guides for the Jewelry, Precious Metals, and Pewter Industries (eCFR text, Wayback snapshot of 2026-07-10; ecfr.gov itself was unreachable from our network)