What is this? and who made it?

I have a necklace that was left to me by my mother, some one told me it is a Navajo Squash blossom circa 1970 but
my son took to a jewelers and they say not silver and the stones are not turquoise just what do I have here?

<img src=/uploads/db3169/original/1X/fe85c806e615ec5003252b4ed47febeda439ebdb.jpg">

hello, the image is very small, can you upload a larger one