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(1) Seeing: In the process of forming natural crystals, it is often affected by the environment and always contains some impurities. When looking at the sun, you can see a faint uniform small horizontal stripes or catkins, commonly known as (ice cracks, cotton wool). The fake crystals are often smelted with crystal slag and glass slag. After polishing and coloring, there is no uniform streaks or catkins.
(2) Check with two colors: natural amethyst has dichroism, and fake crystal has no dichroism.
(3) Check with a magnifying glass: Under the transmitted light with a ten-fold magnifying glass, the bubble can be found as a fake crystal.
(4) Of course, the most authoritative way is to send it to a professional institution for identification.