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Isle of Man 2015 - 175th Anniversary of the Penny Black Stamp-Proof Fine 999.9 1/5oz Gold Crown.
Use a magnet. Nitric acid can tell you if your gold jewelry is real. This is the method most jewelers use. Take a drop of nitric acid and see if it causes a reaction.f you see a milky color reaction, it is probably gold plated over sterling silver. If there is no reaction, your jewelry is real gold. Always take all necessary precautions when handling any type of acid (gloves, goggles, well ventilated area, etc).