Just so you know, 925 is seldom used on Native American jewelry. I only have one piece with 925, and it is also hallmarked by the artist (and I purchased it directly from him). But yours is marked with “sterling,” so it could be Navajo. In general if I see a piece of jewelry with no hallmark that has 925, I might wonder if it’s not Native made.
I meant I don’t know much about the style of your piece, with the chain and all.