Looking for info on this vintage bangle

[jbomb]

All I know is it came to Canada via Bermuda, and is stamped "coin 900" which I believe means it's 90% sterling and likely made before 1900. Anyone have any ideas of its' origins, markings, or the stone (potentially jade)? It's a family heirloom but no idea the history of it

 

[jbomb]

 

[stracci2000]

Native American style, green turquoise.
I would even say that it is machine made, by looking at that arrowhead shaped mark inside, and the odd looking horse motif. Not authentic Native American, but meant to appear that way.
Not as old as you think, probably made 1950s-1970s.