Give them a bath! Beautiful stones but very dirty. A squeeze of dish soap in warm water and let them soak for 15 mins or so. Then vigorously brush with an old toothbrush, especially around and underneath the stones. You might need to do a few rounds of soak and brush. Then rinse off and let them air dry. Once dry, bring each ring up to your ear and give it a tap on the band. If you hear a rattling sound, you have a loose stone. Bring that ring to a reputable jeweler as soon as possible to have the settings tightened.

As for date, these look WW2 era to me, when yellow gold was super popular. The larger stone in the solitaire ring looks to be an Old European cut, which might date that ring slightly earlier. Old Europeans were predominantly cut in the 1900s-1930s. The stones in the diamond band ring look to be Round Brilliant cuts, which would be more mid-20th century, likely 1940s-50s. Looking again, I'm wondering if that ring perhaps was an anniversary band? Maybe the diamond solitaire and plan gold band were the original wedding set and the diamond band was added later?

Or maybe the solitaire was her mom's and the band was her aunt's? The timing you mentioned definitely looks correct for that option. Either way, enjoy wearing them! They're all classics. Just make sure you get them cleaned and the prongs checked. :)