The "Dancing Stone" is a revolutionary patented mechanism allowing the center stone to continuously move, and sparkle, with the smallest movement. It will also move with the beat of her heart. The center stone is Swarovski Zirconia and is suspended from two fine points and is designed so as to not touch the body but continually move in a vibrating fashion. This beautiful pendant is made from .925 sterling silver and comes with your choice of Platinum Plated, Yellow or Rose gold plated. It Includes .8mm 22-inch Adjustable Box Chain. If you have any questions, please call us at 1-800-709-9445 Monday to Friday 10am to 6pm (Central Time). You will love this beautiful piece. It is manufactured according to our high quality standards.