Featured Turquoise Navajo? Ring

Hi All, I picked this up last weekend and trying to figure out the marks on it. Scratched on the back 31-10 and X-13, then a snake, tepee and feathers or maybe arrows on the band (the same symbols are on both sides of the band). Using the image search, it brings up several similar and they say Navajo with turquoise. Could the symbols be a maker mark or just decoration? I didn't realize turquoise came in colours like this , one listing says green turquoise is from Mexico, not sure if this is correct. Do you think it is Navajo or South Western?
any information appreciated
thanks for looking

 

nice ring........ I have my doubts about it's origin..

 

I doubt it's NA. It's not made correctly. It's "in the style of" though. The stone, if stone it is, is something I've never seen before.

 

Turquoise can start being green or change from blue to green with exposure to water and chemicals/body oils. A few examples of turquoise from different mines...... https://waddellgallery.com/pages/turquoise-materials

 

I have a dark green ring that wasn't green to start with, but was by the time I found it. Haven't messed with it. Copper oxidizes green and turqoise contains copper, so....

 

thank-you for the replies folks

thank-you for the link Holly, some beautiful example of turquoise in it