All of our crystals are natural, undyed, and unheated. Our Lava Stone bracelets are made with porous volcanic rock that can be used as a personal essential oil diffuser. Simply apply a few drops of your favorite essential oil onto the Lava Stone beads and enjoy the benefits of aromatherapy throughout the day. Lava Stone is also said to have grounding and calming properties, making it a perfect stone to wear during times of stress and anxiety.