Human Toxicity
Just remember that rescue of wedding rings is best done with at least a fume hood if not a fume cabinet.
Exposure to mercury at room temperature is not that toxic as many high schoolers and their science teachers have demonstrated over the years.
As before said ingestion is not recommended.
Exposure to mercury fumes is a very poor idea, especially long-term.
Mercury compounds are very nasty, especially methyl mercury which has been implicated in Minimata disease in Japan and Northern Ontario.
Minimata like symptoms have been found in people who have eaten pork fed on seed grain treated with methyl mercury to prevent eating by insects and other small creatures.