I would like to make some delicate ornate bezel setting for
gemstones with a cut out detail, however as I imagine I would need
to cast them.
Depending on the final result casting could be an option, although
hand work would also be fine.
Casting technology these days is much more refined than in the days
of the dinosaurs.
You need to decide for yourself which way you go.
You can see many detailed demonstrations outlining the techniques
and results on the internet, only costs you time to look.
Regards Charles A.