I made this freeform heart pendant out of genuine fossil dinosaur bone that came from around the Colorado-utah border. Measurements in the listing title. Sterling silver bail with 5.5mm ID hole that will fit most chains. CHAIN NOT INCLUDED. Metaphysically dino bones are known to help access the wisdom of the ancient ones and connect one with beings in the Spirit realm, assisting in understanding earth changes, evolution and issues of dominance and endurance. If you want to know more just do a quick search.