Advice on tumblers

Hi All, I am in need of some advice on tumblers.

My friend that had the fire has A LOT of Bali beads from her company
there that got black with from the smoke but they are also oxidized
in of course the crevasses. Which type of tumbler and tumbling
material would you suggest to get the outer surfaces shiny again
without disturbing the oxidation?

Another tumbler she would need is for pendants and earrings which
are already bezel set with stones from her company in Bali. Something
gentle as to not scratch the stones which are basically, citrine,
amethyst, topaz etc…

Any help in this matter is so greatly appreciated.

I went to her house the other day, she is very lucky but it is a
mess to clean up and oh… the smell…