The industrial diamond is mounted in the end of the girdling stick and then applied against the rotating diamond which is being shaped. The amount of pressure applied may result in a burnished girdle or on the other extreme, a bearded girdle.
The perfect gray girdle should be waxy in appearance. Also, some girdles are burnished which is a polishing effect without faceting. The cutter accomplishes this in the bruting process by reducing the pressure of the bort (industrial diamond) on the diamond that’s being girdled.