Well, rhodium will not oxidize, jewellers use them a lot, in the same way as gold for plating.
Nickel is most common on watch movements.
Copper is used too, for example on old Omega movements ( "rose gold finish").
Chrome can be used but in very thin layer...never tried, honestly. It is mostly used on watch cases.
Nickel needs copper layer first, if applied on brass.
Rhodium doesn't "like" copper...
Properly prepared and degreased finish is essential.
When doing watch plates, there is no need to remove jewels. Exception is when they are in brass "chatons", like old Corteberts etc...
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djolemag
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