Found old ring belonged to my gran

hello! I'm looking for uour advice on these old rings that belonged to my gran who passed away 3 years ago at 83.
This little box was amongst her other items. Both rings were in it.
One band is hallmarked and looks like its been cut. And the other one has no hallmarks as far as im aware, looks brass with a clear stone. Properly cz.
Whats your thoughts? Junk or hand it into second hand shop. Sorry I've not attempted to clean them yet.
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Hard to tell. Take them to a jeweler. They can test the stone for diamond vs. cz or other. That stone has a tall crown and short table, and the faceting looks "old" like a transitional cut. The ring with the split is probably gold and it split at the solder joint. You can sell jewelry yourself at and but first you must know what it is that you are selling.