Station chain-style design using 2mm cut beads x 5mm cut beads. Appraised Terahertz ore eyeglass chain. Terahertz ore is said to emit terahertz waves that vibrate approximately one trillion times per second. Many people feel the effects of terahertz waves emitted by terahertz ore, which are said to enhance the body's natural healing power, balance the mind and body, promote relaxation, and improve health. The metal fittings are silver, and the silicone rubber is black. If you contact us at the time of payment, we can change the silicone rubber to white. All natural stone accessories and eyeglass chains sold here are infused with "universe energy of development, abundance, and prosperity." You can remove the silicone rubber and connect a lobster clasp with an adjuster to use it as a necklace. The appraisal certificate is an image for confirmation, and the product does not come with an appraisal certificate. #chibinyan eyeglass chain