Use a stable, flat surface.
For linear cutting, use an appropriate cutting guide with an engraver and tungsten carbide wheel.
Make the incision while maintaining constant and uniform pressure.
Split with special cropping pliers.
For linear/jollying, cut with a grinding machine use a diamond disc.
For L or C cuts, make holes at the inner vertices of the area to be removed and proceed with cutting.
For circular holes, use a diamond drill with variable diameter, depending on the size of the holes.
For rectangular holes, make the holes with a diamond cutter at the vertices of the rectangle outline before cutting with a grinder. To make the holes, use a rotary movement without exerting excessive pressure, keeping the surface wet.