What stone do you think it is?

[Steve]

from earlier thread:

Please help to know better this two rings

Hello everyone, I just found two rings and would like to know better them. If you can help me about maybe the Navajo artists behind them, the approximate year when this rings was made and maybe the stones of them ? All the best Jonas [1000028627] [1000028628] [1000028631] [1000028623] [1000028625]