Things You'll Need
Instructions
Wear the gold. If discoloration occurs on the skin, then the metal is not real gold or has a very small gold composition.
Look at the gold. The gold should not be overly shiny. It should look "soft yellow" as opposed to a sparkly metal.
Press a pin through the gold. If the pin breaks, it is not real gold. Gold is malleable and ductile and will give way to the pin.
Cut a small portion of the gold off with a razor blade. Drop the gold into hydrochloric or sulfuric acid. The metal that does not dissolve is gold.
Take the gold to a local jewelry shop. The jeweler will have an X-ray to examine the gold.