Few alternative color palettes can now be used. These options all should be more color blind friendly, hope that some of these are at least a bit better. I could of course add some labels for gems/pylons too but that'd be a bit bigger overhaul and design hurdle so that they don't get in way that much. Also thought of making each gem be a different shape too in addition to just color but that too is a bit bigger thing to do, mostly due to dual color gems.
Or if none of these options work for you, I could also add a completely custom one if you have a set of 6 colors you'd be able to distinguish more easily...