18 of 24 karat parts equals 75%.
White, yellow, and rose 18-karat alloys can all carry the same fineness while using different alloying metals.
Common interpretation
75.0% gold; commonly described as 18 karat
Material category
Gold alloy
What the mark can suggest
750 is a fineness claim of 750 parts gold per 1,000 parts alloy, the proportion associated with 18-karat gold.
What it does not prove
- The color or exact alloy recipe
- Authenticity of the mark
- Gem identity, maker, age, or value
What to check next
- 1Record the full mark and its border shape
- 2Check separate components for their own marks
- 3Use qualified testing for high-stakes decisions
Frequently asked questions
Is 750 the same as 18K gold?
Yes as a fineness proportion: 750 parts per thousand is 75% gold, equivalent to 18 of 24 karat parts.
Can white gold be stamped 750?
Yes. Color depends on the alloying metals and surface treatments; 750 describes gold proportion, not color.
Sources and further reading
This guide summarizes the official and institutional references below. Open the original source for its full scope, jurisdiction, definitions, and updates.
UK Government / British Hallmarking Council
Hallmarking: fineness guidanceOfficial reference for recognized UK precious-metal fineness standards.
https://www.gov.uk/government/publications/hallmarking-fineness-guidance
U.S. Federal Trade Commission
Buying Platinum, Gold, and Silver JewelryConsumer guidance on karat marks, silver fineness, plating, filled products, and maker marks.
https://consumer.ftc.gov/articles/buying-platinum-gold-and-silver-jewelry
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