Putting a small bend in the wire on either side of the bead before attaching to the thicker gauge wire will help keep the bead in place.
Make sure the ends of the large gauge wire don't hang too far over, or they will catch on things and bend.
Copper can turn you green, but it's also believed to have anti-arthritic properties when worn directly on the skin. Other wire options include sterling silver, silver filled and gold-filled. (Links below.)
1 each #05-728-12-24 Swarovski 5728 Scarab Bead, 12mm - Jet