It doesn’t sound as though you really want finished 14k jewelry.
Stuller “and such” are the wholesalers in this industry when you need
findings (like bezels). When you move outside this professional class
of suppliers, you don’t really get “wholesale.” I don’t know if you
consider Rio Grande to be one of the companies that you are trying to
avoid, but they are often competitive with Stuller, and likely have
what you are looking for.