Seeking information about Native American Symbol and Artist Initials JS

Hello to all! Hoping someone can help me identify the artist's initials JS on this lovely sterling necklace pendant. I have been trying to research it and came up with the artist possibly being James Shay or Josiah Smith? But, not at all sure.... Also hoping someone can provide information about the symbol on the necklace and the general design of the necklace -- what does it mean and what is the Native American tribal affiliation? As a side note, the little silver connector on the chain, near the clasp, appears to say MEX 925 and possibly another word above the MEX. However I have no idea whether this chain is original to the pendant. Also fyi, the pendant itself is quite small; it is approx. 1/2 inch by 3/4 inch. Thank you very much for any help on this.

 

the pendant is a casting....& the design........is well.....just a design.
The turquoise inlay is made in a Zuni style....

 

.....maybe James Shay , Navajo

 

the chain is Mexican.........

 

Thanks for your replies. Yes, I have been wondering whether the initials match with James Shay's initials....however, I noticed that on the pendant, the word sterling is in all caps (STERLING), but on James Shay's initials that I have seen online, the word sterling is different (Sterling). Not sure whether that means anything....

 

maybe the difference is between his cast pieces , and hand made silver items....