It should be true. The seller is very familiar with the loose diamonds and rings I bought there at the beginning of the year. At that time, diamonds were only a national inspection certificate, which saved money than American diamonds. The cost of the certificate was more than 100. It must have been added to the price of diamonds in the end. Compared with the national inspection certificate, the authenticity must be guaranteed, that is, the grade can be vague, and the grade that people in the general store say is almost the final inspection.