Regarding the Faberge rings... I have been asking for quotes and ended with various numbers around 2k for the setting (at least I'd trust it be as good as the original!). But the design seems to demand a smallish pearl - 'small' by cultured pearls standards, at least, or else it just looks way different. I am thinking 'conch'. However, the project will have to wait.
A friend is having a version of the design made by the same jeweler - a more complex ring with a green stone. I'll post when ready, but it could be months... there's a backlog.
Sorry if this is more then you ever wanted to hear. The question came twice on the thread