What I'm doing with ep5 is I'm making each level have exactly 20 green gems and 10 blue gems. As for red gems, it varies by level (and I don't keep track of how many there are). No purple because they aren't counted at the end of the level, and so are harder to keep track of. Also, each level has one very well hidden gem ring.

So, it's an idea quite similar to the purple gem concept, just adapted for the way I currently design levels.

I'm also planning on adding this feature to ep3 and ep4.

As for the first two episodes, I MIGHT convert them to be this way as well, by adding red gems and converting the purples to green/blue etc, but this would be a lot more work for me, so it's not a top priority.

I kind of wish JJ2 would keep the gem counter past 100. It would make things a bit more fun imo. Maybe this is something JJ2+ could add.