Watched a documentary on one of the first people producing the lab grown diamonds for rings (jewelry) and he ended up needing to go to China where they were alr

Watched a documentary on one of the first people producing the lab grown diamonds for rings (jewelry) and he ended up needing to go to China where they were already doing the process for drilling and sandpaper type applications. His process was to add flaws of the right type as to make it almost impossible to tell the difference between lab and non-lab diamonds. From what I can tell from it, about half of diamonds being sold as non-lab are actually lab. When we purchased lab was not big yet so guessing its non-lab (not that it matters other than might have over paid). If we (I) were to do it today would just do lab and be done with it as to ensure did not overpay and end up getting lab anyway. From what I can tell no one can tell the difference other than tiny (id markings/ flaws) that can be faked. I know there are sellers that claim to know the provenance of the diamonds (can trace them back to the mine), but that would be the best place to introduce them into the chain. For every truck that goes out half could come from another truck and half from the ground.