Lava Stone is a grounding stone that strengthens one's connection with the earth. Lava stones are great for giving us strength and courage, allowing us stability through times of change. This is a calming stone, it is very useful in dissipating anger.
Lava stones are porous and have craters all over them. So they are able to absorb the essential oils very well. Just drop a drop or two of oil on one or more of the beads on the necklace.