Preheat the oven to 400F. Line a baking sheet with silicone or parchment.
In a medium bowl, whisk together the flour, sugar, baking powder, and salt. Grate the cold butter into the bowl and toss to coat the butter in the flour mixture. Cut in the butter pieces using a pastry blender or two knives until the pieces are no bigger than pea sized.
Add the blueberries to the flour mixture and toss to coat.
In a small bowl or measuring cup, whisk together the eggs and buttermilk. Pour the wet ingredients into the dry ingredients, and mix gently until the dough just starts to come together. Be careful not to over mix and avoid mashing the blueberries as much as possible.
Very gently, pat the dough out into an 8 inch circle, being careful not to overwork it. Cut the circle into eight wedges, and place on the prepared baking sheet. Sprinkle with sugar.