The inkstone is made of stone, such as jade, black as paint, pure in color, black and shiny. Due to hundreds of millions of years of crustal movement and wind and sun exposure, the surface water has flowed and eroded, leaving a more exquisite posture and vivid image, suitable for carving or decoration. It is a good art treasure, but this stone can be re-carved, and its structure will have a different general visual effect. Bao Tong's wealth jewels are various.