Crystal Guidance: Crystal Tips and Prescriptions - OCD. Top Recommended Crystals: Amethyst, Peridot, or Charoite. Additional Crystal Recommendations: Green Jasper, Blue Agate, Onyx, or Purple Tourmaline. OCD is associated with the Solar Plexus and Third Eye chakras. Carry with you or use on your chakras (especially the Solar Plexus) a couple times a week for 15-20 minutes.