Abstract: The process comprises the following stages: cutting at least one groove into the upper surface to a depth therein which is only a part thereof; fixing a thin and flexible temporary support element to the upper surface; making at least one recess which, starting from the lower surface covers the entire width of the body of the tile in a position corresponding to the groove, but not the support element; the recess separating the body of the tile into at least two parts, totally separated; nearing the two parts of the tile by bending the thin and flexible temporary support element which keeps the at least two parts of tile (separated by the recess) united, so that the tile is fashioned into the non-flat predetermined conformation.