I have worked a lot with Swarovski crystals and have only had a
problem with scratching or chipping if the wire is too thick. I
would suggest using 22 ga sterling head pins and attaching them by
using a wire wrap technique. It is relatively easy, looks good and
requires no soldering. You will need a pair of flat nosed pliers
and a pair of round or chain nose pliers.
First slip the crystal onto the head pin. Using the flat nose
pliers, bend the wire at a 90 degree angle leaving about 1/8" of
wire between the bend and the crystal.
Next - with your round pliers, grasp the wire at the bend the
opposite side of the crystal and wrap the wire around the pliers
forming a circle with the wire crossing itself at a 90 degree angle
at the bottom of the circle. (This might take a little practice).
Now slip the free end of the wire through the jump ring of the chain
so that the loop that you have made and the jump ring are entwined.
Then - holding the loop you have made with your flat nose pliers -
wrap the free end of the wire around the space between the loop and
the crystal, keeping the wraps tight and close together. Trim off
the wire close, and…there you have it. Done.
You might want to do a couple of trials with some other kind of bead
or with one of the crystals you have already scratched. If you have
some trouble figuring this out from reading directions (like I do)
and need some pictures - email me off line and I will send you
Good Luck - whatever you decide to do.