This. amazing Peruvian blue opal has a variety of. color; blue, gray, white, and black.  It was set in sterling silver and accented with a blue topaz.  On the side, I added a wire and a stamped design.  
The hinged opening closes over the topaz stone and makes it easy to get on and off.
This cuff cannot be altered to another size.  It will fit a 6.5 to 7" wrist. (Depending on how you like it to fit).