2, check the weight: the density of real gold is higher, so the same volume of gold necklace will be heavier than fake gold.
3. Listen to the sound: tap the gold necklace gently, the sound of real gold is dull, and the sound of fake gold is crisp.
4, magnet test: real gold is non-magnetic, can be tested with magnets, gold necklace is attracted by magnets, then it is fake.
5. Chemical reagent detection: special gold detection solution can be used for detection. It is real gold, which will dissolve in the detection solution, leaving a black residue.
6. Appraisal by professional institutions: The most reliable method is to send the gold necklace to a professional jewelry appraisal institution for appraisal, and more accurate equipment and methods will be used to judge the authenticity.
7. Check the logo: Real gold jewelry will be engraved with purity logo, such as 18K, 24, etc. Without such a mark, you need to be extra careful.