The classic way to bring essential oils into your life! When it comes to tealight candle diffusers, pottery is the most efficient method. Metal, glass, and ceramic get too hot which compromises the therapeutic properties of the oils. We designed these diffusers with our Potter specifically for our tea lights that last 4 hours, The cup on to top holds enough water until the tea light is burnt out. Beautiful colors crafted in the home studio of Cold Stream Pottery.