Anne,
Been away for awhile and without a computer. Thanks for your thoughts. Actually in the mean time I found a set of instructions in the Rio Grande catalog, probably the one for Findings, etc. (not Tools or Packaging). They were marketing some pre-made bezel cups and gave illustrated instructions on making a bracelet (using their products and tools of course). They described a simple technique where you cut a segment out of a silver jump ring, the cut ends mirroring the arc of the bezel side. Then CAREFULLY solder them in place on a charcoal block. (Solder the half jump rings after the bezel is joined and fitted to the stone. Need to do this to located where the attachment points are to be located on a non-round stone. Solder the rings onto the bezel with the stone removed, clean, then set the stone in the bezel.)
I've tried both medium sheet solder and silver solder paste. Both work fine. I tend to use the latter more; the solder seems to "flow" better as it melts around the joint rather than trying to suck sheet solder up a seam. But I'm sure with practice, either technique can be used.
The key here is not to over heat (which I tend to do with sheet solder) and risk melting the shortened jump ring (I've used 18 gauge Argentium silver wire). Need to whip the flame away JUST as the paste solder flows.
The partial rings appear to be very tightly bound to the the bezel through only these two contact points.
Now if only I could do better getting the circumference of the bezel exactly right; either slightly too small or slightly too big.
Rick