I have been searching and searching and searching for a supplier
of rose-cut or faceted cabochons.
Joseph P Stachura Co
has quite a number of rose-cut stones, and I have been very happy
with my dealings with them (plug alert-- look for a piece I wrote up
that is scheduled to be in the April issue of Lap Journal, with a
moonstone and a strand of labradorite beads both from Stachura). I
haven’t bought rose cuts, but I looked them up for one of my
students. If they don’t have what you want, it would not surprise me
if they could get it.