I talked to Kirsten from Pearl Paradise (they really do have amazing customer service). Basically I asked about the possibility of having them make a ring with freshadamas that cold be replaced when necessary. She said it would be no problem!
So I guess I am done with my pearl research for a while and hopefully I'll have some pictures to post in a year or two (or may be more, it's kind of a joke between us about when its actually going to happen)
Thank you for everyone's help!