Pet Charger - 9m-13m, usually 9 being the "easy to unload" price, whereas anything higher is for desperate buyers or greedy sellers.
Luciga Phials 1m-3m, try for 1.5m first since most people BUY them at that rate.
IR Transporters - 5 astros, so 500k-1m depending on the person's rate. If they're from an lolbox type of event, then you can cut it down to 250k-500k.
Opals - Last I checked, weren't they around 1m or some such?
Pink Tourmaline - 25k-50k each, though you can get away with 100k each if there aren't many in the market which is pretty reasonable.
Rose Quartz - 100k, usually.
PERSONALLY, I say sell for the lowest you'd be happy with. It's easier to unload your junk and you won't turn into a greedy inflationatorz. Hooray~<3
"He who fights and runs away, lives to fight another day!"