1. Look at the logo: At present, the gold jewelry produced by Chinese manufacturers is prepared in accordance with international standards, and a K is marked to indicate the gold content of metal products. According to the tags 24K or 18K, you can know the color of the jewelry. However, according to regulations, if it is lower than 10K, the number of K gold cannot be printed. 2. Look at the color: the higher the gold jewelry with higher purity, the darker the color. As people often say "nine purple, seven green, yellow ten red", that is, if the gold decoration is blue yellow, the gold content can reach 70%; the gold content can reach 80-90%; if it is red and yellow, the gold content can reach more than 95%. Of course, it is not enough to distinguish the color and authenticity of gold jewelry alone. 3. Weight: The proportion of gold is 19.3, which is higher than other metals. The gold weight of the same volume is 1.8 times the silver and 2.2 times the copper. Therefore, Shinjin should feel very heavy in hand, and the fake gold feels lighter. 4. Listen to the sound: throw gold on the desktop or hard ground. The lower the gold content, the greater the elasticity, the higher the jump, the crisp sound, the more the sound of the sound; the higher the gold content, the smaller the elasticity, the lower the jump, the lower the sound, and there is no resonance. 5. Hardness test: the higher the gold content of the jewelry, the softer. It is easy to bend with your hands, good toughness, and not easy to break. Use hard objects to leave clear scratches; the lower the gold content, the more difficult. Bending requires a lot of strength, and it is easy to break. Scratch with hard objects, scratches are not obvious. 6. Scientific test: First, through combustion identification. Boil the jewelry in smoke -free fire, and the color is unchanged after the pure gold is burned; dark or black is fake gold or insufficient color. The second is chemical method. Use a concentration of 45%or 70%of sulfuric acid to test spots, and the gold remains unchanged. Silver turned black; copper was green. Because metals such as silver and copper are dissolved in acid, chemical reactions will occur.
1. Look at the logo: At present, the gold jewelry produced by Chinese manufacturers is prepared in accordance with international standards, and a K is marked to indicate the gold content of metal products. According to the tags 24K or 18K, you can know the color of the jewelry. However, according to regulations, if it is lower than 10K, the number of K gold cannot be printed. 2. Look at the color: the higher the gold jewelry with higher purity, the darker the color. As people often say "nine purple, seven green, yellow ten red", that is, if the gold decoration is blue yellow, the gold content can reach 70%; the gold content can reach 80-90%; if it is red and yellow, the gold content can reach more than 95%. Of course, it is not enough to distinguish the color and authenticity of gold jewelry alone. 3. Weight: The proportion of gold is 19.3, which is higher than other metals. The gold weight of the same volume is 1.8 times the silver and 2.2 times the copper. Therefore, Shinjin should feel very heavy in hand, and the fake gold feels lighter. 4. Listen to the sound: throw gold on the desktop or hard ground. The lower the gold content, the greater the elasticity, the higher the jump, the crisp sound, the more the sound of the sound; the higher the gold content, the smaller the elasticity, the lower the jump, the lower the sound, and there is no resonance. 5. Hardness test: the higher the gold content of the jewelry, the softer. It is easy to bend with your hands, good toughness, and not easy to break. Use hard objects to leave clear scratches; the lower the gold content, the more difficult. Bending requires a lot of strength, and it is easy to break. Scratch with hard objects, scratches are not obvious. 6. Scientific test: First, through combustion identification. Boil the jewelry in smoke -free fire, and the color is unchanged after the pure gold is burned; dark or black is fake gold or insufficient color. The second is chemical method. Use a concentration of 45%or 70%of sulfuric acid to test spots, and the gold remains unchanged. Silver turned black; copper was green. Because metals such as silver and copper are dissolved in acid, chemical reactions will occur.