Cleaning jewelry in a rock tumbler produces a great finish as well as work hardening sterling silver jump rings.
When cleaning jewelry I use a small Lortone rock tumbler and stainless steel shot for this purpose, very rarely do I use any other method to clean chain maille , PMC and sterling silver.
I always use this method to polish newly made chain maille rings.
Tumbling with stainless steel shot is not abrasive, provided a gentle liquid is used, and will not remove material from the surface of a metal item.
Metal items do not generally need to be tumbled for long periods of time.