I have 3 other towns and I played them all doing everything, including the settlements, to help move thru story questline and map to get all of the possible diamond rewards. It's quite a few diamonds from playing the game. I'm quite far along in ea now, 2 SAAB, 1 Oceanic; it's really slow especially since I've been making room by removing GB's and I'm not doing Mughal settlement on any and I'm not making the towns any larger: finished Mughal on my primary, nice little building if u like FP's. In the end though only number of wishing wells matters, depends on how u want to collect them. It's a slow bugger to get a lot of them.