The natural green tourmaline needles seem to be black, but appear green in bright light. This pendant is set in sterling silver and measures 20-25mm in length and 3-4mm in width. It comes with the option of an 18 or 20 inch silver trace chain. This is the ideal pendant for everyday wear. To ensure their longevity, handle the item delicately and avoid getting them wet. Please reach out for any inquiries.