Sound Healing - Silver Black Tourmaline Quartz Crystal Grid & Tuning Fork SetJupiter biosonics tuning fork for healing paired with Ariana Ost crystal grid. Use the crystal grid as a sound healing instrument to unleash the powerful frequency of crystals. Black Tourmaline is a protective stone to remove negative energy, Quartz is a stone of strength and power. This grid is a perfect unisex item with a more masculine energy. Black and white are each known to be the reflection of all colors or the absence of color so pairing these