Ruby and sapphire are characterized by dichroism, which can be changed from different directions, and can also be distinguished from genuine products by instrument inspection. In addition, natural rubies and sapphires contain inclusions, while counterfeit ones may not.

2. Emerald

Natural emeralds have inclusions, flaws and dichroism, which are sometimes invisible to the naked eye and can only be observed with a magnifying glass of ten times. Of course, it is also necessary to use instruments such as polarizers to identify them more accurately.

3. diamonds

The most important feature of a diamond is its hardness. It can scratch any jewelry and jade, and the damage to itself is almost negligible, which is incomparable to other gems. Moreover, diamonds are lipophilic and can be detected by oil. Under the irradiation of light, diamonds still have the color of fire, which is not available in ordinary gems.

4. Cat's eye

People are not very familiar with cat's eyes. Although they have heard of it, they don't understand it. Its identification method is that when you turn the cat's eye, you will see a light band in the cat's eye, and there are several fakes.

5. Opal

Opal is also one of the rare gem types. It has many colors and different price levels. When identifying opal, you can put it in water to test its specific gravity, or you can burn it and smell it.