A quality pizza stone is the perfect tool for creating great pizzas, bread, and more on the grill.
There are many pizza stones, and the best modern ones are made from a special heat absorbing refractory type material called cordierite. It is poured into a mold, not just formed from clay as in olden days. It can take more heat, hold it, transmit it to the pie, and resists cracking.
One of our favorites in this category is the Pizzacraft 15-inch square Thermabond Baking and Pizza stone. This model is square but they also sell round and rectangle. You can also use it for bread baking. Even when I cook in a pan, I heat my stone and then slide the pie onto the stone to serve it and keep it warm.