In gemstone carved area, first the workers salary is very cheaper and no machine, So all the carved gemstone all use the handmade to finish. You know use hand carved the gemstone the question is the size and style shape tolerance can not exactly confirm.
But if carved multidimensional gemstone need the CNC machine to carved the gemstone which the size, shape, style and multidimensional all can be carved exactly.
Most of our carved gemstone goods we all use this way to do, it is very popular by customers.