there are a couple of ways to do this:
- for small beads and pearls, using a japanese style pearl drill 2)
using a bead holding jig
in the case where you are drilling the long axis of a stone, where
the ratio of the long axis to the width is anything grater than
about 1.3:1, then what i do is drill the hole first, then use the
hole as the reference point to carve the rest of the stone to.
finding the center of a circle is not always so easy to do when the
circle has a somewhat irregular shape; also, drilling on exact
center is not always so easy to do, as the hole tends to drift off
center; that is why i like the approach above.
Also, i am most likely to loose a piece (trash it) when I am
drilling the hole, either through bad hole placement, or a fracture
developing. if so, then I want this to happen early, before I then
put 40 hours or more carving the rest.