I might choose to set the bluish ones in yellow to enhance their
color, give it more depth. I would also set the clear one in
white. As far as settings go, one of the simplest ways I can
think of, if the equipment is available, would be to melt a
little wax, and push the stone in. Once the wax has hardened you
can file away and make your minor adjustments, cast, and viola!
have a bezel. You also might try carving your entire piece, and
then cast with your stone in place, but this is not a process I
am as familiar with, but there seems to be a lot of information
on it available in the archives. Good luck, Alicia Arnold.