First of all, remember that Rose Cut stones/diamonds have no or any
reflective facets underneath (no pavilion) and are almost as flat as
paper. Also as you are looking at them from above, they are not
spherical, and seem to have corners on them.
In the "ye olde days", it took a setter about 3-4 hours to set an
eternity ring, (before burs and flex-machines). Those setters had to
set their Rose-Cuts in and on a silver strip. Which was then hand
soldered with a low temperature mouth-blow-pipe, fun eh? Not to
mention EACH hole had to be hand-cut to shape for each and every
stones' irregular shape. That hand cutting tool is called a "Bull
Stick", I have one just for display and I also have a Pump-drill that
was used prior to the flex-machine, circa 1940's.
For you, and enough of this back-ground history, shy away from
bead-setting, for these stones are very fragile in nature. I would
stick to the simplest and rudimentary 4 claw setting. I would also
hesitate using cab-settings, why? Too much pressure in forming the
gold OVER the stone. If you must, then use a fine gauge wall to just
hold the stone, and hand-press the gold with a Brass or Copper hand
pushing tool just for these very delicate items. DON'T USE A STEEL
PUSHER!!!!!! If you wish to use a 4 claw setting, try and shy away
from heavy, or thick claws.
What ever the setting you select, remember they have no 'substance'
underneath and your skin WILL DEFINATELY be seen.