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    The hallmark number for 24 carat gold indicates its purity. Here are some examples of hallmark numbers for different caratages of gold:
    • 24 carat gold: Hallmark "999" (99.9% pure gold)
    • 22 carat gold: Hallmark "916" (91.6% pure gold)
    • 14 carat gold: Hallmark "585" (58.5% gold)
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