Hilary - I wouldn’t advise a tumble finish for items with stones
that are set. The abrasives will damage the topaz and the stainless
steel step could crack the stones.
If you have a magnetic polisher, a big one, that could give you a
prefinish without damaging the stones. The machine needs to be big
enough for the piece to move.
While it may be too late for this one, in the future, finish
complicated pieces with tumbling prior to setting stones…