Here are some common ways to tell if a diamond is genuine:
Thermal conductivity: A diamond detector is used to detect whether a diamond has high thermal conductivity. Natural diamonds have high thermal conductivity, which can quickly dissipate the heat transferred by the probe, so that the probe temperature drops;Man-made diamonds and imitation diamonds, on the other hand, have low thermal conductivity and cannot effectively dissipate the heat transferred from the probe, so that the probe temperature remains constant or increases. This method is accurate, fast and convenient, and can be performed at home or in a store, but requires the purchase of a professional instrument.
Fog test: Put the diamond in your hand in front of your mouth and take a breath, the real diamond dissipates heat quickly, so after breathing, it will not easily produce fog. If the fog stays for a long time, or even a few seconds, it is most likely fake. If you repeat the words of the diamond, the fog on the surface of the fake diamond will become more and more obvious every time you breatheReal diamonds are always clear and bright.
Check the refractive index: A cut real diamond will refract light very sharply and brightly, and the light can penetrate without hindrance, if it is glass, zircon, quartz and other materials, the gloss will be less and the refractive index will be relatively low. You can prepare a newspaper or a white piece of paper with black lines drawn on it, and then place the diamond upside down, so that you can't see the words or black lines on the newspaper when you look vertically through the countertop, and only fake diamonds or diamond imitations will see curved black and blurred black marks.
It is recommended to choose a regular jewelry store or brand official website when buying diamonds to ensure that the purchase is a natural diamond.