Silver Plated Black Lava Rock Bead Necklace for Essential Oil Diffuser Aromatherapy Jewelry Gift HAVE fun with the Lava stone bead aromatherapy diffuser necklace, wear your favorite essential oil where ever you go HAND WRAPPED 12mm Lava Bead on a silver plated brass necklace, length available in 16:, 18" and 24".. Variance in size, shape, and color should be expected. Gift box included, ready for gift giving LAVA rock beads are naturally porous, soaking up essential oil and gently diffusing the scent with the help of your body heat TO USE your Aromatherapy Diffuser necklace, place several drops of essential oils on a small plate and dip the lava stone beads in it. Allow time for the essential oil to fully dry and absorb into the lava stone before wearing. Reapply the essential oils as needed DEPENDING on the oil you choose, the aroma will stay on the stones from few hours and up to 2 or 3 days. Essential oils are broken down into 3 main categories (Top, Middle and Base Notes) for aromatherapy treatments. Top notes, such as orange, lemon, lime and grapefruit, are usually dissipate quickly. Base note, such as sandalwood, patchouli and cedarwood, are heavy and last a longer time