925 Silver Hallmarked Black Tourmaline Necklace. 19 inch’s necklace. Protective and grounding benefits of Black Tourmaline: *Protection from negative energy: It is considered a powerful protective stone that can help repel and banish negative energy. *Grounding: It is associated with the root chakra and is used to promote a sense of grounding, security, and balance. *Energetic cleansing: It is used to cleanse the aura and can help one feel calm and focused.