Gorgeous, high quality quartz crystal ball; 21mm-25mm, good caliber! Created in Indonesia for the Lou Zeldis studio. We bought the remaining stock of Lou's crystal and now offer them to you through our website! This is a solid quartz crystal ball (no hole), from the same stock which Lou used in his jewelry. As one example on how Lou used these rock crystal balls see his classic 1980s "Rock Crystal Gyroscope Necklace/Choker" design. Most are clear, while a few have internal matrix.