12" choker necklace with 2" extender chain does more than just add an elegant touch to any ensemble. It also diffuses your favorite therapeutic essential oil. Look closely and see the tiny leather swatch sticking out of the heart. Put a drop of oil on the leather and tuck it into the filigree opening to create a beautiful, portable diffuser! Purchase includes 5 tiny leather swatches and a vial of essential oil of your choice.