I think fetishes will be the main magical economy items with these settings. For 30 gems you can make 2, when a clam cost 35 (then alchemize or trade the production for pearls if you want).
It may be a bad point for balance as the few nature/fire nations (or lucky players finding enchantress) are the only able of large fetish hoarding (taking a n/f pretender isn't sufficient as there is no fire/nature summon like the naiad allowing to go from one fetish a turn to many).
Then the good point is : it's harder for Rlyeh and other wish capable nations to make them.
