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Jewelry is rarely made of “pure” or 24kt gold because the metal is too soft and does not hold up to a lot of wear. That being said, Ankur simply needs to look for the kt stamp on the locket.
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ankur may apply this test:
Genuine gold will stand up to your attempt to conduct a nitric acid test at home. Make a tiny mark on the piece of gold to penetrate the surface. Drop a small amount of liquid nitric acid on that scratch and wait for a chemical reaction. Fake gold will immediately turn green where the acid is
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