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There are different strengths of the acid for 10,14, 18. I haven't seen any 24K yet. I expect I would be able to verify that just by looking at it. The real stuff scratches differently on the stone so a lot of it you can tell just be feel.
Many pieces are stamped in various ways, such as "10K" or "417". If its from this country by law it's supposed to be stamped, but I see a lot of fake stuff stamped, and I see a lot of real stuff not stamped.
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