Lava Stone Aroma DiffuserThe Lava Stone Aroma Diffuser is an aroma diffuser made of a cast iron vessel with a lid and lava stone. The rounded form of the vessel gently encases the rough, porous lava stone created from solidified lava. Remove the lid and add a few drops of essential oil (aroma oil) to release the fragrance into the space. The lid can also be flipped over and used as a base for the vessel. Casting is a manufacturing method where metal is melted, poured into a