Lava Rock is cooled volcanic lava and comes from the center of the earth, making it one of the most grounding stones. It is known for its healing properties and is considered to be excellent for stabilizing and grounding the root chakra.
All you need to do is use 2-3 drops of your favorite oil on a cotton swab and dab the oil onto the stone and let the rocks do the diffusing for you. You could also drop the essential oil directly on the rock but be careful not to waste any of your essential oils. After a few days, the scent will wear off, which allows you to try another scent or refresh the previous one.