I can tell you for sure that it won't be cultivated, because black pearls can't be cultivated yet. But it may be artificial, and the certificate is not credible. You don't even have basic information such as the size and price of a picture. How do people evaluate you? The simplest and most effective way is to think it's true. If you really want to find out, the simplest and most effective way is to burn it. If it's really burned and wiped, it's still the same. If it's fake, you can't recognize it. You still have to have a good attitude, which is true.