There is a photographer in Portland, Oregon: Daniel Van Rossen:
http://www.vanrossen.com/ who shoots a lot of jewelry photos of
Oregon artists.
Also I believe Hap Sakwa another well-known jewelry photog lives in
San Francisco.
And another suggestion…I have spent a lot of time looking at
jewelry on www.guild.com to see what I like and don’t like. It
helped me and my photog work out a “look” for my jewelry photos.
HTH
Carla