Stoneware is a common type of pottery and needs to be fired at a high temperature, usually between 1,100 and 1,300 degrees Celsius. Stoneware is non-porous and does not need to be glazed except for decorative purposes. Stoneware will shrink depending on the clay used. Stoneware is dense, impermeable and hard. Unglazed, it is grey or brown in color.