The synthesizing rod used in six-plane piercer to synthesizing diamond includes catalyst sheets in 0.1-0.25 mm thickness and carbon sheets in 0.5-0.75 mm thickness laminated alternately. It is suitable for forming nuclei and growing of diamond homogeneously, and the formed diamond is symmetrical, perfect in crystal form, high in transparency, high in static pressure strength and high in grade. The present invention can raise the grade and yield of diamond, save noble metal for catalyst and raise the utilization of the catalyst sheets and carbon sheets. |