I currently have 8652 lingots and nothing to spend them on other than streak freezes. I prefer doing my lessons on IOS as it is easier to get the proper symbols and accents. However, since that system uses the health format and gems, I end up having to buy gems to maintain health. Is there anyway that Duo could let us exchange lingots for gems? It would make my life easier...
There is no way that I'm aware of to exchange lingots for gems.
However, you do not have to buy gems to maintain health: