Ashlar

Ashlar is finely dressed (cut, worked) masonry, either an individual stone that has been worked until squared or the masonry built of such stone. Ashlar is the finest stone masonry unit, generally cuboid or less frequently trapezoidal. Precisely cut “on all faces adjacent to those of other stones”, ashlar is capable of very thin joints between blocks, and the visible face of the stone may feature a variety of decorative treatments from quarry faced to tooled to smoothly polished.