Not all accurate
Please read all, So I went to the beach and I got some stones and I put them in this scanner and I took 3 photos of each and on one of the rocks it came up with 3 different rocks, I wanted to see if this was fake or not so I put in my moonstone and it came up with another rock (forgot what rock though) Then I put my new Amethyst and it cam up with light rose quarts ,like what! But I do believe this can work you just need the right angle but guess what on one of the rocks I got from the beach it said it was Sapphire blue but I am 100% sure that it wasn’t a gem so download to try but for me it did not work! But I can tell the creators of this app at least tried.