1, look at the color: according to the different luster and color of gold, pure gold, k gold, real gold and fake gold can be roughly distinguished. That is, red and yellow are the best gold, and the purity is above 95%; The fineness of positive yellow is about 80%; Cyan accounts for about 70%; Yellow is light gray, and the fineness is about 50%. Therefore, there is a formula of "seven green, eight yellow, nine five red, yellow and white with gray and half gold". For jewelry that has been hidden for a long time, there is a saying that "copper turns green, silver turns black, and gold never changes color".
2. Bending hardness: Gold has the characteristics of ductility and low hardness, and can be pressed into thin sheets with a thickness of 12.7 microns. When the folding hardness is high, scratching with pins or nails will leave traces. More than 97% of gold ornaments are colored, and wrinkles appear after bending for two or three times, also called fish scales; Gold ornaments with a fineness of about 95% feel hard when bending, and the scales are not obvious; About 90% of gold ornaments are hard when bending, and there are no fish scales; Gold jewelry with many impurities will break after two or three bends.
How to choose gold ornaments
Product information should be clear. The contents of the label at least include the name, weight, product standard number and the name of the production or sales enterprise. The name of jewelry consists of material name and variety name, which should indicate the true attribute of the product. There cannot be anything else before or after the name. The words "yellow retro 18K gold ring" and "rose gold meteor exquisite earrings" are redundant. If there is, it can only show that the label is not standardized and it is suspected of raising the price.
Jewelry based on weight should be marked with weight. Remember to verify the actual gram weight of gold ornaments before buying. Weight is the decisive factor affecting the price of gold jewelry. The state stipulates that weight-based jewelry is sold in grams and carats, and the label must contain the marked weight.
The above contents refer to Baidu Encyclopedia-Gold Jewelry.