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What does 99.9 Gold Hallmark GMmean?

Updated: 9/26/2023
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Q: What does 99.9 Gold Hallmark GMmean?
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What does the hallmark 325 mean on gold?

325 hallmark is not a standard hallmark and it is not 9 karat. It might be that it is 32.5% gold inside. 9 karat gold has a hallmark of fineness 375. 8 karat gold has a hallmark of fineness 333.


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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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