I recently attended a bunch of online presentations, hosted by Halstead Jewelry, and several were about photographing your pieces and parts. They have a blog where many of these presentations, not the video, are posted. I found many educational and as a photographer myself, very spot on and helpful.
https://www.halsteadbead.com/articles/p/2#recent
https://www.halsteadbead.com/articles/p/6#recent
https://www.halsteadbead.com/articles/p/7#recent
Just a few links pointing to photo advice. Check it out! Great resource.