Well, I would have put the briolettes on last, after pickling and
tumbling the chain. I'm surprised that you managed to solder the
links with the labradorite on them (unless they are quite large in
diameter and you used a good heat sink). Normally, the labradorite
would not be able to tolerate that... Are the labradorite brios
literally threaded onto the hoops soldered to the chain or are they
separately wired to the hoops?
I would not recommend putting the chain into the tumbler with the
brios on there. I think it will destroy the stones.
Hope this helps,