Well ~ the file upload manager isn't working, so if Cathy can come to my rescue, we're in business! I have resized the photos, so it isn't that.
Thank you so much, Cathy!
Here's a look at the variations. The bead nucleus measures 4mm, however I can't tell what the material is. Nacre is at least 1mm thick. The smaller pearl was 6mm. I was so excited about the smashing I forgot to measure the other pearl! I do put them in a little baggie, otherwise the fragments go all over. They do not smash easily, either.