in a glass of water, measuring how much the liquid level rises. With this data you can calculate the density and compare it with that of pure gold, which is approximately 19.3 grams per cubic centimeter. If the value obtained is significantly lower, the part contains alloys.
Inspection of marks and seals
Authentic gold pieces usually have engravings indicating their purity in carats (e.g., 24K, 18K, 14K) or thousandths (999, 750, 585). Although this method is not definitive because stamps can also be forged, it is a useful first approach to discard obviously counterfeit parts.
Limitations of at-home tests
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