Gold Hallmarks
Understanding common UK gold fineness marks and what they do – and do not – prove.
Common UK Gold Fineness Standards
UK hallmarking standards include several gold fineness levels expressed in parts per thousand. Common jewellery examples include 375, 585, 750 and 916, with higher-purity 990 and 999 standards also recognised.
- 375 = 37.5% gold, commonly 9ct
- 585 = 58.5% gold, commonly 14ct
- 750 = 75.0% gold, commonly 18ct
- 916 = approximately 91.6% gold, commonly 22ct
- 990 = 99.0% gold
- 999 = 99.9% gold
A Number Alone Is Not Necessarily a Full UK Hallmark
A proper UK hallmark contains the required combination of marks, not just a purity number. A standalone “916” or “750” stamp can be useful information, especially on overseas jewellery, but should not automatically be described as a complete UK hallmark.
Gold Factory and Hallmarking
Gold Factory sells jewellery across several purities. Jewellery that requires a UK hallmark should carry a legally recognised hallmark. Some lighter items may fall below the statutory gold weight threshold of 1 gram or be covered by another exemption.
Hallmarks Do Not Make Counterfeiting Impossible
Marks can be copied onto fake or plated items. When we buy precious metals, we assess the actual metal using appropriate tests rather than relying solely on a stamp.
Frequently Asked Questions
Is 750 18ct gold?
Yes, 750 is 75% gold and corresponds to 18ct.
Is 916 the same as 22ct?
It is the common millesimal fineness associated with 22ct gold.
Is a 916 stamp always genuine?
No mark should be trusted in isolation when authenticity matters.
Why might a very light gold item have no UK hallmark?
It may fall below the compulsory gold hallmarking threshold or another exemption may apply.
Ask Gold Factory If you would like help applying any of this information to a real piece of jewellery, visit us at 294 Farnham Road, Slough, SL1 4XL, call 01753 536800 or contact us through www.goldfactory.co.uk. Jewellery can vary, so our team can explain the options for the actual item you are considering. |
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