Amethyst bracelet can't see cracked cotton wool in the sun, each one has tiny impurities, and there is no cotton. Is it fake?

There is still a difference between a crystal and a flashlight. Because it has a refractive index. The light you encounter will be different. Do you really want to identify the true and false? The first one should be the specific gravity, which feels heavy in your hand. The second is that you can put it in a place without light. A dark place. Real amethyst will be very bright. As long as there is a little light. It will refract beautifully. There is no way to grow crystals. But there are inclusions and cracks in real amethyst. Most of Chengdu is a bubble.