Crystal Guidance: Crystal Tips and Prescriptions - EMF Protection. Top Recommended Crystals: Black Tourmaline, Amazonite, Lepidolite, or Sodalite. Additional Recommendations: Smoky Quartz or Jasper. Electromagnetic Frequencies are given off by electronics such as computers, TV's, cell phones, etc. Carry or wear your crystals to protect yourself from EMF pollution. Place crystals between you and electronic device. Get unpluged and get outside..