Let me start by saying that I have bought and sold thousands upon thousands of pieces of Native American jewelry, starting back in the early 1980's.  Thought this bracelet is simple in form, I am TOTALLY perplexed by the two cabochons set in the face of this bracelet.  Through a jeweler's loupe it strongly resembles petrified wood, but the color is much too "off white" for that.  I'm no expert on stones OR fossils, but I don't believe this to be any kind of jasper or similar stone, and honestly think it's a fossil of some sort. With that said, PLEASE buy this for what YOU think it is.  I am merely throwing my opinion into the ring for you to consider. 
  The face of this bracelet measures approximately 1 7/16" (measurement from top to bottom of mountings with unknown cabochons in them).  The inside measurement, from side to side, is approximately 2 1/2", and it has a 1" gap at the back.  There are no maker's marks, nor any marks as to the metal content, though I will unequivocally guarantee this to be solid Sterling Silver.  In EXCELLENT condition.