Synthetic diamonds are cheap and good, comparable to natural diamonds in all aspects. Artificial large single crystal diamond can be produced by CVD (chemical vapor deposition) method and HPHT (high temperature and high pressure treatment) method, also known as "diamond cultivated in laboratory". At present, the level of production technology, through process control, makes artificial diamonds comparable to natural diamonds in crystal form, even more perfect than natural diamonds, but slightly different from natural diamonds in luminous characteristics, color, inclusions and crystal form. Compared with natural diamonds with a retail price of tens of thousands of yuan/carat, the price of synthetic diamonds at the same level is only about 70%.