Interesting find. We believe the purple stones are amethyst. Looks to be a mix of at least two or three metals: Copper, Silver or Alpaca and maybe brass. There is so much going on in this cuff bracelet, it?s hard to tell. Best described as ?Brutalist? or ?Bohemian?. Seems to fit a 6 inch wrist - perhaps a bit bigger if you can get your wrist through the 1.25 inch opening. Has some weight to it at 50 grams (1.7 ounces).