I have NOT bought Amy's tutorial (being broke atm!), but I tried this from the public posts she has made (thank you, Amy, for your generosity!). Keep in mind that I am dot-challenged, which is why I wanted to make some of these beads. This is an exercise in learning precision, for me.
Obviously I made my initial dots too small, and I need to work on dot uniformity. I also need to be less timid & make sure my transparent completely covers my white opaque. Other suggestions?
Here's the same technique in chalcedony:
FWIW, I apologize about he pictures. I have bunged up my camera settings & am getting way too much noise. Oh, well, will find my way back. I was starting to play with actual settings rather than automatic presets. It;s the step backward that makes you learn, I think.