This essential oil diffuser pendant necklace was made by hand using a natural red earthenware clay. The heart shaped design is textured on the front and is left unglazed for a natural, organic look. It was fired in the kiln to over 1900 degrees. The pendant is approx. 1 7/16". It comes with a black satin cord necklace with adjustable sliding knots. Just drop 1-3 drops of essential oil onto the pendant and wait 1-2 minutes for it to absorb into the earthenware clay. Then wear your diffuser necklace and enjoy the natural scent all day. Add more oil as needed.