Biosonics Rose Quartz Gem Foot Attachment – “25 mm” (does not include tuning fork)Gem Foot attaches to the base of any weighted tuning fork. The universal healing stone, channels the energy of all stones through intention focused through the stone that sets it in oscillation. Place stone on your body, feel the vibration coming through the sound. Crystals are channels of light. Sound intensifies the light. Crystals are receptacles for healing.