The diamond core bits on ebay are real cheap from china and some work well. I used them to punch these beads out and drilled the holes by eye, some you can tell, some not. The material is stuff I collected in Hachita. I then used pins in small pin vises to hold the bead against a vertical 6" diamond flat from Lopackis rotating at about 600 rpm to rough them in and homemade sanding wheels of the flap design to sand down to level where I could finish with diamond powders. See his bead tutorial at lopacki.com for information on how the bead works. The bottom pix is before polish at about 200 grit sanding level....b
