Man's sterling silver ring inlaid with dinosaur bone and black onyx handcrafted by Mark Hileman. Three pieces of reddish-brown dinosaur bone with black webbing are accented by two pieces of black onyx. The Utah dinosaur gem bone in this silver ring came from the Colorado Plateau and was a living animal during the Jurassic Period around 144 to 208 million years ago. Ring measures approximately 9mm wide and is a size 10. Special order available in other sizes and stone colors.