Tumbled Kyanite (price is for one, intuitively chosen).
Balances chakras, strengthens intuition, brings peace. Promotes good communication. Helps break self-destructive behaviors.
Try meditating with it on your 3rd eye!
Every stone does more than is listed here. The best way to choose is to use your intuition. Just because someone says a stone does or doesn't do something, doesn't make it true for you. I encourage you to use them as you feel called.