Black tourmaline is the most powerful protection stone. It grounds and protects from negative energy. * Oversized raw tourmaline ring * adjustable to fit everyone on any finger * stone size ranges from 1 to 2 inches long * no two rings are the same but all are equally magnificent * compliments our large collection of black tourmaline jewelry Black tourmaline: It's the most powerful of protective stones. It swallows up negative energy, amps up courage and strength. It's also frequently used for grounding, cleansing, focus and meditation.