Made with natural stones, designed for educational or decorative purposes. This is a set of nine polished natural stone spheres representing the Planets of our solar system (including Pluto) Each sphere is made from a different natural gemstone, such as Clear Quartz for Mercury, Picture Stone=Venus, Sodalite=Earth, Red Agate=Mars, Tiger Eye=Jupiter, Yellow Jade=Saturn, Aventurine=Uranus, Blue Agate=Neptune, Amethyst=Pluto. Comes in a nice wooden display case. $50 Free Delivery