Andrew: With all due respect, I would disagree with you. First,
you are assuming she is trying to set a diamond or some other
stone which can withstand the heat of removing the bezel form
your plate. Also, I don’t care how well you’ve cut your seat, if
the stone’s not stuck down first, it’ll jump around. Also, I’ve
found that beeswax is better as I’ve used glue in the past. I
could never be sure if the stone was tight after setting or just
held in by the glue. Don’t know about you, but I want to be sure
before my customer walks out the door!
IMHO;
Steve Klepinger
Steve, You make a good point about the perils of using glue.
Cyanoacrylate is the first thing that comes to mind when I want
to tack something small into place - but I’d hate to think it was
the only thing between a gemstone and oblivion. I hadn’t thought
of beeswax. (I really love this list! 
) -Pete-
Steve,
There’s no need to unsolder the piece from the plate; just
simply saw it off and clean up the scar. A well seated stone, in
my experience shouldn’t move around too much.
Andy
Andy: You’re right of course, assuming you want to make a pendant
or perhaps earrings which have the findings already attached and
require no further soldering. However, you would need to solder
it onto a ring and if heat-sensetive, you’re sunk.
As for the well-seated stone, next time you try to hammer down a
bezel without securing it someway, you will see the stone jump
all over the place. I just hope you can find it again.
Merry Christmas!
Steve