'pizza baking surfaces' on Serious Eats
If you haven't seen one up close and personal, a pizza screen is just what it sounds like. Mine is exactly 14 inches in diameter, and is made from expanded aluminum with a solid aluminum rim. The theory is that the screen allows the heat of the oven to hit the dough directly.
Go shopping for a new pizza stone, and you'll find a huge variety of surfaces, from metal to clay to natural stone to man-made composites. If you were going solely by recommendations from respected testers, you might settle on the baking stone sold by King Arthur Flour. I decided to put it to the test.