Sharon
Has anyone used bezel punches? What gauge metal should be used?
is the start of just such a discussion from the usage stand point,
as far as thickness of the metal. Here is a link to a thread that was
fairly long on the subject and you may find value in it
and you might find value in this one too, as it is an inspection
process for set stones which also covers the thickness of the bezel.
professionaljeweler.com/archives/articles/1998/aug98/0898fys1.html
Additionally there is this link to Hoover and Strong on the subject
of bezels.
Sorry I could not give a specific answer.
Terry