The domestic diamond certificate will also mark the relevant content of diamond 4C, including diamond color, diamond weight, diamond cut, diamond clarity. The color standard of the domestic diamond certificate is similar to GIA, with D, E and F as the best; The weight of the diamond is carat, the larger the carat value, the larger the diamond; Domestic diamond cutting points for general, good, very good; Diamond clarity is divided into five grades F to I, F, IF is the best.