Well there is at least one lawyer "married" to this forum so maybe she can chime in?
Lending money here is always a disaster as most people live on the economic cliff edge out of choice, it seems, and any slight problem is enough to cause disaster.
It appears you have already gone down the "local" kampung road without success? One wonders if this person is using at least some of the stolen money to keep the local "officials" calm?
Maybe consider threatening to make a police criminal case out of the "stolen" jewelry? Threatening, to start off! Balinese are dead scared of any police involvement.