Your post indicates your fairly new at stone setting. Believe me
we all were once. I learn plenty from this forum and am happy to
Don’t ever touch a file to a gem even gently. The main reason is
you can chip or abraid even diamonds. It goes without mentioning
the damage some stones could do to a perfectly good file.
Instead concentrate your efforts in the process of stonecutting,
with cutting a perfect seat. All that you need to do be it
bright cut, channel, gypsy, etc., is get the stone in deep
enough with a correct (not oversized) seat, and you will have
room to do your cleanup without damaging stones. Even with the
most concave, difficult areas to set stones; if you proceed
slowly, and confidently you can have enough metal to work with,
and minimize cleanup. Take your time, cut your seats as
precisely as you can, and use non stone cutting rubber wheels
near your stones. Any rubber wheels are OK with diamond.