Elegant, 7.5" Natural Lava Stone beaded bracelet that also serves as an Essential Oils Diffuser! Simply rough a Black Lava Stone with a small grain emery board (not a metal file) then place 2 drops of essential oil onto it. This procedure removes a small portion of the wax that the manufacturer coats the Lava Stones with. Be sure to test the oil on a hidden spot on your skin for signs of irritation, as some essential oils need to be diluted.