Is this a Navajo Piece?

Hi, I won this necklace in an online auction. It also has sterling stamped on the back (actually it says terlin because the s and the g are worn off), and I was told the stone is malachite. The pendant appears to be handmade. The chain is stamped “925 Italy,” with the letter “S.” I’m coming here because it looks like a lot of the Navajo pieces I have found online. I really hoping someone here can tell me something about this necklace. I’m so curious. Thank you for your time. Mary

<img src=/uploads/db3169/original/1X/7fe2161b86500db32c7b7d0025d5dfcebcc16a14.jpg">

<img src=/uploads/db3169/original/1X/91c24950161555fa4d0d5f10495f2256ca9bc746.jpg">

From the picture it looks like the whole piece is one casting, same with the back, I don’t believe this is Navajo handmade. It is malachite, thanks for sharing