If you are really interested in buying it, it is recommended to buy one with GIA certificate, because the standards of GIA are the most stringent among the above certificates.
Look at its contact information, especially its telephone number. It's in Shenzhen Shuibei Jewelry Industrial Park. If you know the staff of the jewelry inspection agency here, you'd better appoint them to send them for inspection, and then buy them if there is no problem.
If you don't know anyone, you have to take some risks. Because even GIA certificates are issued by the United States, Hong Kong and India; Basically, the United States is more reliable, Hong Kong is not reliable, and India is very unreliable; But it doesn't mean that diamonds are in America.