1. Seeing: Natural crystals are often affected by environmental influences during the formation process. When viewed from the sun, you can see a faint uniformity of fine stripes or catkins. The fake crystals are often smelted with crystal slag and glass slag. After polishing and coloring, there is no uniform streaks or catkins.
2. Tongue: Even in the hot summer days, using the tongue to rub the surface of the natural crystal, there is a cold and cool feeling. Fake crystals have no cool feeling.
3. Illumination: The natural crystal is placed vertically under the sun, and it can give off beautiful brilliance from any angle. Fake crystals can't.
4. Check with the hair: put the crystal on a hair, the human eye can see the double shadow of the hair through the crystal, it is natural crystal, mainly because the crystal has birefringence. However, this method is also limited, generally only used for the crystal of the bead type, and the faceted crystal is not suitable for this method.
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