An artificial stone is disclosed for use in creating a covering a supporting surface. The artificial stone includes a base portion for placement on the supporting surface, which base portion is shaped as a right regular prism for patterned, fitting arrangement of the flagstone with like flagstones to produce a continuous surface covering. The base portion has a regular base contour. The stone further includes a top portion with a facing surface, the facing surface having an irregularly shaped top contour different from the base contour and an intermediate portion connecting the top portion with the base portion. The intermediate portion has an inclined wall extending between the top portion and a sidewall of the base portion. Stones of this construction can easily be arranged in a regular, repeated pattern to generate a continuous covering for the supporting surface without the surface of the resulting covering having a regular, patterned appearance. The irregular top contours of the stones, simulate the appearance of natural stone.