Brick Oven Round Grill Stone (13-Inch) This grill stone's ceramic stone material allows for even heating and absorbs moisture to deliver a delicious crust. This stone is oven safe up to 500 degrees Fahrenheit (260 degrees Celsius). This grill stone measures 16 inches across, and is large enough to cook most pizza sizes. This cooking stone should be hand-washed only. Hand-wash with warm water and a mild detergent; rinse and dry immediately. This product comes with a limited lifetime warranty.