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A gold hallmark is an official stamp on gold jewelry or coins that indicates the purity of the gold and often the assaying authority. It helps buyers know exactly what they are purchasing.

Key components of a gold hallmark:

  1. Purity mark – Shows the gold content, e.g.,

24K or 999 = 99.9% pure

22K or 916 = 91.6% pure

18K or 750 = 75% pure

  1. Assaying mark – The official stamp from a government-approved assay office or hallmarking center.

  2. Manufacturer’s mark – Identifies the jeweler or company that made the piece.

  3. Optional year or logo – Some hallmarks include the year of manufacture or a certification logo.

✅ Why it matters: Hallmarks ensure authenticity, prevent fraud, and give you confidence about the gold’s quality before buying or selling.

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The hallmark for 18ct gold is typically "750," indicating that the gold is 75% pure gold. This hallmark is often accompanied by a specific symbol or maker's mark to further identify the origin of the piece.


What does 220 mean on a gold hallmark?

220 is not a gold hallmark. The lowest number that is used as a gold hallmark is 333 (meaning 33.3% gold content, which is 8 carat, the lowest gold carat). 220 is actually the hallmark for bronze, which is a copper alloy called "Alloy 220" (or sometimes sold as "commercial bronze"), not gold.


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What does the hallmark ba on gold mean?

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Is it gold if there is no number in the hallmark?

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