Epoxy will glue almost all plastics with the exception of the 'slippery' ones like polypropylelen, polyethylene, PEX, CPVC, and similar.
Epoxy itself is glue that will hold to metal.
There are no health risks of epoxy glue,unless you ingest it.
ABS Yellow glue by Oatey's is by far the best cement for ABS. I have tried many things and using epoxy is not as good as a solvent bond, which is literally melting the components together.
Yes you can use epoxy glue inside. You can use it anywhere.
epoxy works for wood and metal.
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Any of the normal epoxy glues would be usable for this.
Epoxy if not much to glue. PL200 in caulk tubes if there is lots to glue.
You can find epoxy glue at most hardware stores and at Walmart, Rona and Home Depot.
Epoxy or E6000 would be nest. White glue won't stick to the jewellery.