Identification method of true and false crystals (1) At first glance, in the process of rock crystal formation, it is often affected by the environment and always contains some impurities. When you look at the sun, you can see tiny and even stripes or catkins. Fake crystals are mostly made of inferior crystal slag and glass slag. After polishing, coloring and imitation, there are no uniform stripes and catkin-like substances. (2) Lick your tongue: Even in the dog days of hot summer, licking the surface of the crystal stone with your tongue will feel cold and cool. Fake crystals are not cool. (3) Illumination: When the crystal is placed vertically in the sun, it can emit beautiful light from any angle. Fake crystals can't. (4) Hardness: The hardness of the crystal is very high, and it will leave no trace when lightly scratched with gravel on the jewelry; If there are streaks, it is a fake crystal. (5) Inspection with a polarizer: the rock crystal rotates 360 degrees under the polarizer, with four bright and four dark changes, while the fake crystal does not change. (6) Check with dichroism: natural amethyst has dichroism, while fake amethyst has no dichroism. (7) Magnifier inspection: under the transmitted light, the bubbles that can be found can be basically classified as pseudocrystals. (Check with hair: If the crystal is placed on the hair, then the rock crystal is the kind that the human eye can see the double shadow of the hair through the crystal, mainly because the crystal has birefringence. (9) Test with a thermal conductivity meter: set the thermal conductivity meter to 4 squares of green to test the gem, and the rock crystal can rise to 2 squares of yellow, while the false crystal does not rise, and when the area is large, it will rise to 1 square yellow.