Hi
I’ve tried to find out what the markings might be on both rings (the backs definitely back up BigBree’s identification of age 
)
I’ve had no luck with the first ring but the second one looks like UEX - when I searched this a few items came up (all Zuni Petit Point) but no listings under those initials in any books or websites that I could see - however a question regarding the identification of this artist was asked on this site in Feb 16 - I’ve attached a screenshot of it - as you can see the item was purchased in Mexico in the 1940’s. I can’t see that the query was replied to but someone might know a bit more about this artist? Hope that helps
Michelle x
