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there are a number of commercially avilable products that test the purity of gold (the Carat) from that you can extrapalate the percentage.

9 carat = 37.5%

on the otherhand if it's recenlty made in a developed country it will be marked. (9ct or 9k)

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12y ago
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Q: How do you calculate percent gold and number of Karats?
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