Using cast pieces that will need to bend is never a really good
Annealing won’t help.
To prove this just look at any mass produced cast tongue clasps or
safety fold overs. They never work and don’t have any spring to them.
You can’t even tighten them. Also look closely at cast prongs. The
metal is just too porous and kind of crunchy and may break when bent
over the stone. that’s why die struck crowns are superior.
Forged metal is far superior for any flexing situations.
This is not about cast vs forged. Both have their places and uses.
However that said…
If you really really want to cast this bracelet… you might want to
experiment with Stuller’s Continuum silver. I Continuum has a very
nice spring and hardness when heat hardened at 800f for 45 minutes
and then quenched while hot. If possible I’d also have the casting
HIPed. Techform does that to platinum castings. A high pressure and
high heat treatment, it collapses the voids and makes for a much
denser casting. I have no idea if they do this with silver.
Have fun and make lots of jewelry.