You have come to the right place for answers to questions you
thought you'd never ask this forum is very informative you gotta
check out the archives there's alot of tips there.
You say you work with a wide variety of stones, what is it that
you do? cut, facet, lap, tumble. I to cut stones I haven't read
but a few comments about them here though. Hey maybe this reply
might get it rolling.
Well, I wish you the very best hope you like the forum as much
as I do.
Ken's Gems and Jewelry