Diffuser for Essential Oil.  Black Onyx, Hematite & Lava Rock 8 mm Beads with a Silver Slider with Hearts and Rope Designs.  Fits Wrist Sizes 7.5-9 Inches.   "Metaphysical Properties of Hematite are: A strong Rooting Stone, it is connected with the Root Chakra and Solar Plexus Chakra. Hematite is a protective stone and can help calm you in times of stress or worry."