Portable rock art with imbedded diamonds.

Has anyone else found possible diamonds imbedded in the portable rock art? I have noticed that in the majority of my findings there are various sizes of crystal clear stones, especially used for eyes but also randomly placed in holes in the rocks. I purchased a rather inexpensive diamond tester and most of the clear stones test positive for diamonds. Of course I realize that I'm not a jeweler or anything close to one and I also realize the cheap tester is not reliable. But there is one rather large colorful rock I found in the same area that looks almost identical to one I saw online that was verified as having authentic diamonds. If not for this finding I would not be asking what I would normally deem as an outlandish question. I would love to hear anyone else's thoughts.

Hi Stacy, I have one find with an embedded crystal in, set in a limestone elephant / humanoid head sculpture, I have not tested it, but it also appears worked so I doubt it to be diamond. I have pondered the use of diamonds in working the stones, this is perhaps how some of the markings etchings in the flint may have been produced. I do look out for diamonds on my find site, which would be in the natural form of an octrahedral shape, these have been found on other prehistoric sites in the UK.