Green Stone Bangle Bracelet Vintage 8-8.5 "

I bought this vintage bracelet at an estate sale and I have no idea what it is made of. it's cold to touch and remains cold. It has a small chip in it. one of my photos reflects this. It has weight to it. It's pretty regardless of what's it's made of. Measures approximately 8 to 8.5 " Please see photos for further details