You can put Essential Oil onto the surface of the stone(normally back side). Wait for the stone to absorb the oil.
Adjust humidity of the environment for the best diffusing purpose.
Made of natural stone powder. No need heating or fire ignition for diffuse.
All aroma stone are handmade and bubble pores may appear on the surface. Or some surface area is not flatten.
Colors are different for each stone. It is a handmade product and may not be perfect. Please do consider carefully before purchasing and aroma stone products are non-refundable and exchangable.