The marking and identification of 999.9 gold jewelry
Identification
The labels of 999.9 gold jewelry usually appear in the forms of "999.9 gold", "999 gold", "gold999" or "g999", etc. These labels clearly indicate that the gold content is no less than 99.9%. In addition, symbols such as "Au999" may also be used, where "Au" is the chemical element symbol for gold. These marks are important bases for identifying 999.9 gold jewelry.
Identification method
Check the certificate: When purchasing 999 gold jewelry, the merchant should provide an appraisal certificate issued by an authoritative institution. The certificate will have anti-counterfeiting codes, steel seals, signatures and other information. Consumers can verify the authenticity of the certificate through the query website.
Observe the appearance
Color: 999 gold presents a reddish yellow color, which is bright yet soft. If the color is too light or too dark, there might be a problem.
Hardness: 999.9 gold is soft in texture and can leave a shallow mark with a fingernail. If it is difficult to leave a trace, it may not have sufficient gold content.
Listen to the sound: When genuine gold hits the ground, the sound is dull, while fake gold makes a clear and crisp sound. By tapping the jewelry and listening to its sound, one can initially determine its authenticity.
Magnet test: 999.9 gold is not attracted by magnets. If a magnet can attract jewelry, it is very likely to be a fake.
Density test: The density of 999 gold is approximately 19.32 grams per cubic centimeter. By measuring the mass and volume of jewelry, calculating the density and comparing it with the standard value, it can assist in determining the authenticity. However, this method requires professional tools and operational skills.
Chemical reagent test: Put 999.9 gold into nitric acid. If there is no reaction, it is genuine gold. If a chemical reaction occurs, it might be fake gold. However, this method may cause damage to gold jewelry and should be used with caution.