The Serenity Diffuser Bracelet includes both Lava Stone beads and White Howlite beads. White Howlite is a calming, soothing stone that dispels anxiety and stress, making it ideal for encouraging spirituality, patience, harmony, and meditation. Lava beads are made of rocks that form when volcanoes erupt magma (lava) onto the surface of the earth and the magma cools. Lava beads are porous and can absorb the oil of your choice.