Slice cherries in sixths, removing the pits, so they're roughly the same size as the blueberries. Mix together all berry sauce ingredients. Cut brie in thin quarter-inch pieces.
Spread mascarpone evenly across pizza crust (using your hands is easiest), then drizzle berry sauce evenly across the top, then place brie slices across the top, evenly-spaced.
Bake for 12-15 minutes or until crust starts to turn golden and brie is melted; sprinkle caviar across the top, if desired; cut in thin slivers and serve hot.