2. The weight of the gold is 19.32 grams per cubic centimeter, which is larger than metal such as silver, copper, lead, and zinc. Therefore, high -purity gold jewelry will feel heavily on the hand, unlike other precious metals, it feels light. Of course, if it is a golden bag tungsten in the gold, it is useless to use the weight method, because the proportion of metal tungsten is the same as gold.
3. Listen to the sound, and fall the gold jewelry about one foot from the plane naturally, and the gold with a purity of more than 990 ‰ (foot gold) or more. Because the non -elasticity will make a dull noise, the gold or fake gold with low purity will generally emit out of the gold or fake gold. The sound of "Dang Dang" will have a sound, and it will be beaten after landing.
4. Test hardness, low purity gold and hardness, soft and toughness, use nails can draw light marks, teeth can leave tooth marks, easy to bend, the more copper, the greater the hardness. For finished gold jewelry, because it is not convenient for scratch and bite, as long as you observe it carefully, you will see the scratches left by the surface due to the transportation or placement process.
5. See the mark. According to national standards, precious metal jewelry should print the manufacturer code, precious metal materials, and precious metal purity before leaving the factory, and the precious metals with different materials or purity make a piece of jewelry, which should be printers separately. If the gold content reaches 990 ‰, it is necessary to print sufficient gold or G990, and the gold content reaches 999 ‰ to print thousands of gold or G999. The gold content reaches 750 ‰ to print 18K gold or G750 or AU750. The word "GP" is printed with gold plated.
6. Burning with fire, since ancient times, there is a saying that "real gold is not afraid of fire", so gold is high -temperature resistant. Its melting point is 1063.43 ° C, and gold will not be oxidized in the melting state. Therefore, the jewelry is burned with fire with fire. After cooling, if the surface is still the original golden yellow, it is high purity gold; if the color becomes darker or darkened to varying degrees, the purity is low or not gold.
7. Repeated claims that gold jewelry must be remembered immediately, because the gold jewelry is soft and the abrasion resistance is not high. After wearing it for a long time, the gold jewelry is easy to wear, which leads to a reduction in weight. In the future, doubt will occur. In addition, when you buy gold jewelry, remember to ask the merchant for a regular invoice.
8. See if there is any processing traces, the surface of the gold jewelry must be bright and clean, there are no marks of obvious processing, no obvious sharp corners, and the feel is smooth. There are no pores, impurities, etc. on the surface. In addition, you should also carefully observe whether there are cracks to avoid buying secondary processing accessories.
