How to identify gold: 1. Observe the color: According to the folk experience of "seven greens, eight yellows, ninety-five reds", observe the color of gold. Determine the quality and authenticity; 2. Look at the mark: Generally, gold jewelry is engraved with the manufacturer's name and the gold's fineness (K). If the trademark is correct and the handwriting is clear, the quality will be basically clear; if there is no stamp, the reprinted gold jewelry can be tested on the touchstone. 3. Weigh the weight: The proportion of gold is second only to platinum. Real gold should feel heavy in your hand, while fake gold should feel firmer. 4. Test the feel: You can gently bend the jewelry with your hands. If it feels soft, it means it is real gold, otherwise it is fake gold. The above is a physical method to test and identify gold, and its accuracy is not very high. If you want to identify gold more accurately, it is best to use chemical methods. The specific method is as follows: rub the gold jewelry on the touchstone a few times, then add a few drops of nitric acid and soot, and rinse away the silver and copper components with water. If it is gold, it will leave a golden color on the touchstone, otherwise nothing will be left. Keep. The amount of alloy can be determined by comparing the shade of golden color left on the touchstone with the control gold. For the identification of gold jewelry, you can also use a gold color tester. Determine the color and authenticity of gold based on the measured K value and density value. However, this instrument is accurate for measuring solid jewelry, but has a larger error for small and hollow gold jewelry. Personally, I think it is safer for you to go to a specialized testing agency for inspection. I know a friend who bought gold jewelry in a large shopping mall a few years ago. It took several years to have it authenticated and found out that it was fake. Because he bought it in a large shopping mall at the time, he went to the merchant and took out the test report. As a result, the money was refunded. Therefore, it is more safe to buy things in large shopping malls. The hardness of platinum is between 4-5M (Mohs hardness scale)