Help identifying different types of spiderweb turquoise plus 3 unknown artists

I recently purchased several pieces of vintage turquoise jewelry including several rings. Some of the spiderweb pieces are my favorites, but I am having a hard time figuring out what type of turquoise is in each one. I think I have identified one, and then I second guess my i.d.! Any expertise is welcome. Also, I have found several artists listed, but a few are still a mystery. If any of the posted 3 marks are identifiable, please let me know. Thanks!

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