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There are two different numeric scales used in hallmarking. The numbers 1 to 999 or 0K to 24K may be used to show the amount of gold in the item. ... For the U.S. system, 24K is 99.9% pure gold, 18K is 75% gold, 14K is 58.5% gold and 10K is 41.7% gold. Anything less than 10K is considered fake.

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