When setting a colored center stone with side diamonds, make certain that the diamonds do not touch the center stone. If one of the diamonds comes loose and rubs against the center stone, it will cut a groove into the stone.
When setting stones in thin rings that may bend, take a ball of shellac that will fit easily into the finger hole of the ring. Warm the ball of shellac and place it in the finger hole. Then place the ring with the ball, in a ring clamp and tighten the clamp. The warm shellac will spread through the ring supporting the thin top for setting. To remove, warm the shellac and push out. When cool place the ring in alcohol to remove the remaining shellac.
When channel setting diamonds or other gemstones, always undercut the same side of the channel on each stone. Alternating the undercut side may cause the stones to set unevenly when finished. Before cutting the seats, mark one of the walls of the channel with a felt tip maker. Then, you will be certain to always undercut the same side of the channel. This is particularly important if you are interrupted while cutting the seats.
Before bead setting stones, properly
measure the thickness of your metal. At a minimum, the metal should be as thick as the distance between the girdle and the culet.
If the metal is too thin, you will not have enough metal to get a good bead.
If the metal is particularly thin, use a setting bur that is slightly dull. Then, rather than cutting the metal away cleanly, it will push some of the metal down. This metal will bulge down below the plate supporting the stone.