2 thoughts on “How to query authenticity of Chinese gold gold jewelry”
Theresa
Generally, the products purchased are a product guarantee form. You can go through this query . If you want to detect it, you need to go to a professional institution.
1. Look at the color Ben according to the different luster and color of the gold, you can generally distinguish the pure gold, K gold, real gold, fake gold. That is, gold is better yellow (yellow -red), and the color is more than 95%; the positive yellow color is about 80%; the blue and yellow color is about 70%; the yellow color is slightly gray and the color is about 50%. Therefore, there is a formula for "seven green eight yellow, yellow nine five red, yellow leucorrhea ash pairs of gold". For jewelry from Jiu Tibet, there will be a saying that "copper turns green, silver turns black, and gold will never change color". 2, 量 This than the same volume of silver, lead, and tin weighing. True gold has a feeling of falling on the hand, while copper or others only have a sense of heavyness without falling. 3, folding hardness has high -colored gold, and traces can be left with large head needles or nails. More than 97%of gold jewelry, after twisting two or three times, wrinkles appear at the bending, also called fish scales; about 95%of gold jewelry, it feels hard when bending, and the fish scales are not obvious; about 90%of the golden gold golden gold; The jewelry is very hard when the bending is bent, without fish scales; gold jewelry containing more impurities, bend twice or three times to break; if it is made for raw gold, the bend is broken. When using this method, the width and thickness of the jewelry should be considered. The thick and width should be hardened, and the thin and narrow ones are softer. 4. Use the test gold stone to identify the color The use of the gold -pairing card (the gold medal of the fixed color) and the subject's first jewelry on the test gold stone to determine the color of the gold jewelry through the contrast color. This method should be carried out under natural light and sunlight, and cannot be carried out under the direct sunlight and incandescent lamps. This in the past often used testing gold stones to determine the general content of gold. Testing gold stones are a mixed black mineral such as quartz and protein -containing quartz, and the gold is drawn on the test stone to see the general shape of the gold. Pure gold: shiny dark yellow, thick yellow; silver gold: light color change slightly green green; gold containing silver greater than 25%of gold: earth white; copper -containing gold: deeper color, red color tone; silver copper tone; Gold: yellow; gold containing zinc, same, nickel: white gold. 5. Use acid point Man the golden road of the identified jewelry and the cards on the testing stone, and test the nitric acid on the golden road with a glass stick. Therefore, the color is unchanged. If it is not gold or non -pure gold, the Golden Road disappears or changes. The law of changes is "three fast, three slows", that is, the low color disappears quickly, and the high color disappears slowly; Depending on the disappearance of its golden road, compare cards can determine the color of gold jewelry. 6. Burning with fire The gold jewelry to burn red (do not melt the jewelry) with the fire (do not melt the jewelry), and observe the color change after cooling. Or to varying degrees, it is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry. After burning red, it is quenched into the water, and the color remains unchanged. It really does not change color when it comes to fire.
Generally, the products purchased are a product guarantee form. You can go through this query
. If you want to detect it, you need to go to a professional institution.
1. Look at the color
Ben according to the different luster and color of the gold, you can generally distinguish the pure gold, K gold, real gold, fake gold. That is, gold is better yellow (yellow -red), and the color is more than 95%; the positive yellow color is about 80%; the blue and yellow color is about 70%; the yellow color is slightly gray and the color is about 50%. Therefore, there is a formula for "seven green eight yellow, yellow nine five red, yellow leucorrhea ash pairs of gold". For jewelry from Jiu Tibet, there will be a saying that "copper turns green, silver turns black, and gold will never change color".
2, 量
This than the same volume of silver, lead, and tin weighing. True gold has a feeling of falling on the hand, while copper or others only have a sense of heavyness without falling.
3, folding hardness
has high -colored gold, and traces can be left with large head needles or nails. More than 97%of gold jewelry, after twisting two or three times, wrinkles appear at the bending, also called fish scales; about 95%of gold jewelry, it feels hard when bending, and the fish scales are not obvious; about 90%of the golden gold golden gold; The jewelry is very hard when the bending is bent, without fish scales; gold jewelry containing more impurities, bend twice or three times to break; if it is made for raw gold, the bend is broken. When using this method, the width and thickness of the jewelry should be considered. The thick and width should be hardened, and the thin and narrow ones are softer.
4. Use the test gold stone to identify the color
The use of the gold -pairing card (the gold medal of the fixed color) and the subject's first jewelry on the test gold stone to determine the color of the gold jewelry through the contrast color. This method should be carried out under natural light and sunlight, and cannot be carried out under the direct sunlight and incandescent lamps.
This in the past often used testing gold stones to determine the general content of gold. Testing gold stones are a mixed black mineral such as quartz and protein -containing quartz, and the gold is drawn on the test stone to see the general shape of the gold. Pure gold: shiny dark yellow, thick yellow; silver gold: light color change slightly green green; gold containing silver greater than 25%of gold: earth white; copper -containing gold: deeper color, red color tone; silver copper tone; Gold: yellow; gold containing zinc, same, nickel: white gold.
5. Use acid point
Man the golden road of the identified jewelry and the cards on the testing stone, and test the nitric acid on the golden road with a glass stick. Therefore, the color is unchanged. If it is not gold or non -pure gold, the Golden Road disappears or changes. The law of changes is "three fast, three slows", that is, the low color disappears quickly, and the high color disappears slowly; Depending on the disappearance of its golden road, compare cards can determine the color of gold jewelry.
6. Burning with fire
The gold jewelry to burn red (do not melt the jewelry) with the fire (do not melt the jewelry), and observe the color change after cooling. Or to varying degrees, it is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry. After burning red, it is quenched into the water, and the color remains unchanged. It really does not change color when it comes to fire.