Our aromatherapy diffuser jewelry is made of naturally porous lava rocks. When essential oils are applied to these lava rocks, they will retain the scent of the oils so you can enjoy aromatherapy benefits anywhere you go. A drop or two will do the job but feel free to add more or less of the essential oils to your liking, or simply enjoy the beautiful bracelet without adding any oils at all. The aroma of most oils will last several days on your bracelet, although it doesn't hurt to reapply them each day to keep a consistently strong scent. This design is accented with turquoise colored howlite stones. Although oil will not hurt the gemstones, the black lava beads are the ones that will absorb.