Want to learn about gem stones

[bulrush]

I'd like to learn a bit more about gem stones and how they can help metaphysically. I have a lot of stress in my life and I'd like to learn more about stones that might help that, get rid of negative energy, etc.

Is there a site where I can learn that sort of stuff?

Thank you.

EDIT: I might have lead or mercury poisoning too. I was exposed to it as a child. You remember mercurochrome that you put on open wounds?

Should I buy tumbled or "raw" stones?