A couple of thoughts
Since the items now take up a ring slot, should the item prequiste be changed from Craft wonderous item to Forge Ring?
These rings exist as pair, correct? That is to say that a third circle of bonding can do nothing for a paired set. Perhaps the descriptive text could make this explicit. Perhaps each ring of the pair shares a common device that varies from pair to pair according to the desires of the rings creator.
Is the price listed for a single ring or for a pair?