It’s not fixed, if you mean glued/held in place by something other than wire. It’s just centred on the wire. With the design held perfectly vertical, pull the briolette straight down a bit (not too hard if your briolette is made of a soft stone). This will make the wire bend a little at the brilette holes to keep the bead better placed.

I can’t show you the back of this one. It’s already sold

Thank you! It’s such an easy thing, even with so many steps. You could even wire wrap the surrounding wire, or encage the briolette with very thin wire across the circle.