I have used an ionic cleaner to remove this type of tarnish off of
silver jewelry that included stones and pearls. Quick and easy,
and no toxic chemicals needed. I haven't tried Argentium.
l’ve used my ionic cleaner on Argentium. Works just fine and doesn’t
harm pearls, turquoise, etc. A light scrubbing with a soft
toothbrush finished the removal of tarnish. Be aware that the
surface will not be as polished when the tarnish is gone.
To restore polish, I use a vibratory tumbler with dry crushed walnut
shell charged with a rouge-like media. Got both from Rio decades
ago, so check their current website or catalogue for availability
and price. The stuff lastsforever.
Judy in Kansas, where an ice storm left every twig covered with ice.
Very pretty, but those heavy limbs fell on power lines, leaving many
without electricity. Big Bummer!