When sizing gold rings, if everything has been done correctly as far
as making sure ends meet with no gaps, hard solder is used, there are
some rings where the seam still shows after polishing. Any tricks to
solve this so it never happens?
I burnish the seam over with a hammer handpiece or air graver with a
rounded and polished anvil. I run it 60 to 90 degrees from vertical
and 45 degrees across the seam, then 90 degrees away and then in the
opposite direction and angle using light pressure and a high speed.
The objective is to push shank metal over and into the seam and
work-harden the surface a little. It leaves a slightly dimpled
surface, so be careful if it’s thin. I then lap it or sand it smooth
removing as little metal as possible, and go directly from that to
rouge, polishing 90 degrees to the seam. This also works for that
occasional pesky pit or two.
If it’s a color issue, I’ll sometimes add a little copper, silver or
24k to a few easy to medium solder pallions (50-50 to 20-80 by
eyeball?) to make it a closer match (copper for more red, silver for
more green, 24k to darken). It will raise the flow temp, but not
usually so much as to make it impossible to use. You’ve done enough
soldering to be able to recognize if it’s too hard before any damage
is done, though.
If sizing down, you can also fuse in the little piece you cut out,
if the ring will take the heat.
Anyhow, those are some of the ways I try to do it.