They advised to wear certain metal bracelets, gem stone jewels to ward off negative vibrations of planets and stars.
Have you heard about the stone called "Howlite"?
It is said to bring calmness to those who wore that stone in some form on their body. If you are learning meditation for the first time, Howlite will assist you without your knowledge in meditating successfully.
I have heard of stages who used Howlite to have out of body experiences. Some say that Howlite cures insomnia too. Incidentally, Howlite is a rare mineral.