Heart Aromatherapy Essential Oil Diffuser Necklace Locket Colorful Lava Stone US. Shipped with USPS First Class Package. Heart Openwork Essential Oil Diffuser PendantYou are buying the pendant and getting a free necklace.Let us know what color stone you want in your pendant.Item Description: Necklace length: 18 inch (45cm)Lava bead size: 20*21mm Metal: cooper locket and necklaces with rhodium planting. This is nickel and lead free jewelry-How to use: Just rub a drop of essential oil on to the lava stone and enjoy the aroma for a few hours or up to a few days, depending on the oil you use. Once the aroma fades away, re-apply oil or oils on to the lava bead- Lava stones are safe with essential oil, it will become glossy and prettier when soak in it. Lava stone never get corrupted or dissolve in essential oil no matter how long time. you can use it with essential oil as long as you want.About natural lava Stone: -Lava stones are unique in that naturally-formed voids and irregular surfaces are part of their beauty. The porous material of the rock is what allows the scent to stay and last. Send me a message after you pay and let me know what color you want. Blue, Black, Yellow, Pink