The article shows a photo with the pearls highlighted with circles. I'm generally skeptical of AI, but this system produces a certificate that a human can verify much faster than doing the work themselves. IMO, that's the right way to do it. You can trust the system 99% of the time, and check a random 1% by eye every day. Or, you can keep a human fully in the loop and still save time (though, if the error rate is too low, humans will get bored)