Agatized fossilized dinosaur bone is found in the four corners region of the Colorado Plateau, where the states of Arizona, Colorado, New Mexico and Utah touch. This material dates back to the late Jurassic Age around 150 million years ago. Fossilized dinosaur bones are found in many places around the world but this highly agatized and beautifully colored dinosaur bone is found almost exclusively in the four corners region. This is indeed a rare gemstone. This pendant is 27x21mm (1.05" x .83") Chain not included.