Preheat a 14 to 16-inch pizza stone in an oven set to 500°F (260°C).
Prepare the unbaked pizza crust (14 to 16 inches) and brush 1 tablespoon of olive oil evenly over it. Smash half of the blackberries and spread them across the crust.
Sprinkle 1 cup of shredded mozzarella cheese and 1 cup of shredded parmesan cheese over the pizza.
Halve the remaining blackberries and scatter them over the pizza. Place heaping teaspoon-sized dollops of ricotta cheese randomly across the top.
Bake on the pizza stone for 10 to 15 minutes, or until the cheese begins to brown.
While the pizza bakes, roughly chop or chiffonade (cut into strips) the 10 large fresh basil leaves. Add the basil to the pizza during the last few minutes of baking.
Remove from the oven and slice into 8 large pieces.