Saw this in a microscope review and found it, well, mildly interesting. They're likely overpriced. It would be neat to get a hold of one of those etched silicon wafers (which I suppose is what they are). Should not cost more than a few dollars. There's several brands but they may all be the same manufacturer. I did not look into it deeply. Here's two, a search for nano bible will probably yield more: https://mynanojewelry.com/collections/nano-bible https://tanaorjewelry.com/ Blurb >Nano Bible jewelry features amazing miniature Bibles engraved on tiny chips, offering pocket Bible KJV scripture in beautiful gold Bible designs and sterling silver pieces. Furthermore, each mini Bible contains either the complete New Testament or Old Testament, with letters 100 times thinner than human hair.