Gem Guide

So I have been wondering this for a while, but I figured that this is the best time to ask. What is the best way to get gems without editing the time? (My device doesn't support time editing) I'm doing a playthrough of the game without telepods, in-app purchases, etc. I want to know the best way to grind gems, so I can progress quicker in the playthrough. Any answers would be very appreciated! :D
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