Hallmark guide · Gold
750 and 18K gold: what the stamp means
750 (75% gold) is 18 karat. It is a UK legal fineness and was a standard recognised by the 1972 Vienna Convention, and one of Italy's legal gold finenesses.
- Metal
- Gold
- Purity
- 750/1000
- Where
- International
01
Often confused with
- '18K GE' or '18K GP' are plated, not solid gold.
- The FTC Guides require the karat to precede the word 'gold' with equal prominence.
02
What a piece marked 18K / 750 is worth
Melt value $934.72. Likely cash offer $654.30 – $841.25.
75% pure gold25% 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)