What is the characteristic of different synthetic ways?
The technology of producing diamond on stable pressure with catalyst is that: on condition of thermodynamic stability of diamond, synthetic diamond is produced through high temperature and high pressure (by belt-type press or cubic press) with graphite as raw materials and metal/alloy as catalyst. Most of ultra-hard material companies (about 90%) adopt this way to produce synthetic diamond. The technology of producing diamond directly through stable pressure does not use catalyst, but it needs higher pressure and temperature and thus needs better press, so it is not widely adopted in trade. The technology of producing synthetic diamond on high pressure and temperature realized by detonator explosion can produce micron diamond crystal which is often imperfect and brittle. This technology does not need expensive equipment and can realize high productivity, but it is difficult to control temperature.
