After the diamond is wet with water, scratch it with a pencil, and there will be no pencil marks on the surface of the real diamond. Transparent fake diamonds such as crystal, glass and tourmaline will leave traces.

Pen recognition method

Dip a pen in ink and draw a line on the diamond. The lines of real diamonds under a magnifying glass are made up of dots.

Water drop identification method

Wipe the top surface of the diamond and dip a toothpick in a drop of water. The water droplets on a real diamond will be medium-sized round water droplets. The water droplets on the fake diamonds will soon disperse.

Because diamonds are the first noble and luxurious ornaments, it is not uncommon to replace or pass off diamonds with cheap gems, artificial gem and even glass. Common "fake" diamonds are as follows:

1. Zircon: Very similar to diamond, it is the best substitute for diamond. The identification method is that zircon has polarization and large birefringence. Observing the processed zircon prism surface with a magnifying glass of 10 times, it can be seen that the bottom edge line has obvious ghost, but the diamond has no ghost phenomenon. ：

2. Glass: The refractive index of glass is very low, and there is no flickering color like diamonds; Especially when it sinks into the water, the glass product loses its luster and immediately shows clues.

3. Soviet diamonds: cubic zirconia, first developed by the Soviets, hence the name. Soviet diamond is a synthetic compound, but it is very close to natural diamond in dispersion and refractive index, and it also has the attractive appearance of "fire" light. But its hardness is low (8.5), so it can be distinguished from diamonds. Moreover, the thermal conductivity is much lower than that of diamond, so it can be identified and distinguished accurately by "thermal conductivity meter".

4. Crystal: Although crystal is a transparent crystal of natural minerals, it looks like a diamond after processing, but it lacks the color light of a diamond.

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