I fuse al my fine silver bezels with 24 ga round wire.
Technically, I think this doesn’t count as fusing-- the sterling is
very-hard solder as compared to the fine silver.
I can’t say that I make a habit of this, but I learned in a
granulation workshop that it is possible to fuse a fine silver or
high-karat gold bezel just by itself. Whitney Abrams showed us-- you
start with a taller bezel than you need, and after getting a tight
fit, brush a bushy flame across the joint until the surface of the
metal liquifies and flows into the joint.
You start with extra width because you may melt the edge a little,
especially if you then fuse the bezel to its backing. This is
necessary if you’re going to granulate around the bezel, but not
generally called for in other applications. Heck, I only drain the
solder out of bezel joints about every 50th bezel-- now! ;>)
It takes considerable practice to do this reliably, but it
definately can be done. Fuse, that is, though I guess the same could
be said for draining the solder out of a bezel seam.