Look for hallmarks or stamps indicating purity, such as "24K" for pure gold.
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Magnet Test:
Gold is not magnetic, so if a magnet doesn't attract the item, it may be gold. However, this test is not conclusive as other metals could also be non-magnetic.
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Density Test:
Real gold is dense, so it should feel heavier than most other metals of similar size.
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Acid Test:
Gold does not react to nitric acid, while other metals might. However, this test can damage the gold item.
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Scratch Test:
Real gold is relatively soft, so it should leave a mark when scratched against a ceramic plate. If the mark is gold-colored, it may be real.
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Professional Appraisal:
Consult a professional jeweler or appraiser who can use specialized equipment to accurately determine the gold's authenticity.