Leah and I are working on figuring this out right now. The basic premise is this...
Anyone can "read" Orchid for free and Ganoksin for free.
Silver members can participate in the forums (get the email digest every day, get email alerts, etc)
Gold members can do that, plus I am going to figure out a bunch of other stuff for them (special content, special access, special offers). My goal is to make gold a no-brainer for anyone.
Platinum is targeted toward people who advertise to jewelers (including other jewelers).... goods or services. Leah and I are figuring out how best to have them represented and able to advertise, while not disrupting the value of the forum.
We are working on this now.