New Estrella & Luna Raw Black Tourmaline Gemstone Stud Earrings. 14K Gold Plated or 925 Sterling Silver Hypoallergenic posts. Handmade in USA! October Birthstone Black Tourmaline is a protective stone which repels and blocks negative energies. Black Tourmaline is thought to purify negative thoughts it can encourage a positive attitude regardless of circumstances. It is also a powerful grounding stone and helps with work/life balance. Relieves stress, anxiety, fears, anger and ill wishing ~ Reverses obsessive or compulsive behaviors ~ Guards against negative internal and external influences ~ Facilitates the removal of bodily toxins and wastes