Natural Stone Essential Oil Diffuser Beaded Bracelets 8mm. Choose your Gemstone! All bracelets have 3 Lava Stone beads; put a drop of your favorite essential oil on them to enjoy the scent for up to 72 hours! All gemstones can be paired with gold or silver beads to suit your aesthetic! Bracelets are made to stretch and measure about 15-16 cm each. Please let me know if you need smaller or larger no extra charge!