Preheat a 14 to 16-inch pizza stone in an oven set to 500 degrees Fahrenheit.
Prepare 1 (14 to 16-inch) unbaked pizza crust. Brush 1 tablespoon olive oil over the crust. Smash half of the blackberries and spread them out over the crust as well.
Sprinkle 1 cup shredded mozzarella cheese and 1 cup shredded parmesan cheese over the pizza.
Halve the remaining blackberries and scatter them over the pizza. Place heaping teaspoon-sized spoonfuls of ricotta randomly over the pizza.
Bake on the pizza stone for 10 to 15 minutes, or until cheese starts to brown.
While the pizza is baking roughly chop or chiffonade (cut into strips) 10 large fresh basil leaves. Scatter basil over the pizza during the last few minutes of baking.