Hi icey. I used to sell lamp rings, which were made of fine china. A ring with a channel to drop a little essential oil into, such as lavender, you could put it safely on top of the bulb in a lamp, or remove the bulb, pop the ring over, replace bulb.
I always had to tell people not to add water as well as the oil when I discovered someone doing this. It is an easy and cheap way of getting a nice aroma in a room, particularly lavender from a bedside lamp. And because you are not falling asleep with a naked flame still alight, as in a burner, it's safe.