What kind of gold jewelry is good?
1. Recognize the manufacturer and the color. The gold jewellery surface should be printed with the manufacturer and alloy purity (color) and the words are clear. For example, the gold jewelry produced by Beijing Jewelry Factory with pure gold is printed with the words “Jing E Jin Jinâ€. If the jewellery is unmarked or the imprint is ambiguous, the authenticity of the gold jewellery should be suspected. 2. Check the color and hardness. Gold should have a dazzling reddish yellow color. The higher the color, the more beautiful the color, so people often say "seven green, eight yellow, nine five five red." The so-called gold jewellery, which is pseudo-named by other metals, is recognizable in color. The hardness of gold is low and soft. If you use a knife to make a light stroke or bite with a tooth, there will be traces. Other metals do not have this feature. Moreover, the higher the color of the gold jewellery, the softer it is, and the height of the color can be checked by bending. If the color is low and contains more silver and copper, it is not easy to bend. This method can be used to identify whether the jewelry is shoddy. 3. Compare the weight. The proportion of gold is 19.3, which is higher than metals such as silver, copper, aluminum and tin. The same volume of gold is 40% heavier than silver, 1.2 times heavier than copper, and 6.1 times heavier than aluminum. By comparing the weight, it is also possible to identify whether or not to fake gold jewelry with other metals. 4. Listen to the sound to identify the ingredients. The jewellery falls naturally from a height, and if it only emits a "beep" sound, and there is no sound and no elasticity, it is a gold with a purity of 990 。. If the sound is long and elastic, it means that its color is not high, and the jewelry contains more copper and other metal components. 5. Nitric acid distinguishes the authenticity of gold. Put the jewelry in nitric acid. If it is gold, it will be safe and there will be no change. If it is copper, it will emit green smoke. 6. Taste the authenticity. Put the jewelry in the mouth and rub it with your tongue for a while, then smoke. If there is no smell, it is gold; if there is sweet smell, it is copper. 7. Fire knows the truth. "True gold is not afraid of fire to refining", after the jewelry is cooled by high temperature, if it is still yellow, it is gold if it is not deformed; if it turns black, it is not real gold, it is a counterfeit product made of other metals.
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