Is it a fraud to sell crystals by fortune telling?

There is a kind of crystal that can tell fortune. What's its name?

This is a pendulum.

Pendulum test is a very good and simple method, which can directly use our intuition, and intuition can be used as a very powerful diagnostic assistant to guide us. A pendulum is a light weight or crystal connected to a rope or chain, which can swing between the index finger and thumb of the dominant hand.

Generally, crystal pendulums have special shapes, and most of the pendulums on the market are only white crystals (the most obedient); Tea crystal; Green ghost; Obsidian (the most disobedient)

It's been almost half a month since my baby changed it for me, and I still don't listen.