Understanding Gold Purity: Karats, Fineness, and Hallmarks — July 02, 2026
When buying gold, understanding purity is crucial. This guide explains the different measurement systems used to describe gold content.
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Gold Purity Measurements
- 24K (999.9 fineness): Pure gold. Too soft for most jewelry but ideal for bars and investment coins.
- 22K (916 fineness): 91.6% gold. Common in coins and high-end jewelry.
- 18K (750 fineness): 75% gold. Popular for fine jewelry with added durability.
- 14K (585 fineness): 58.5% gold. Durable and affordable, common in everyday jewelry.
- 10K (417 fineness): 41.7% gold. Minimum standard for gold jewelry in the US.
Hallmarks and Authentication
Always look for official hallmarks from recognized assay offices. In the UK, the Goldsmiths’ Company Assay Office provides certification. In the US, the Federal Trade Commission regulates gold marking standards.