As with your other suggestion, this is not well thought through.

If you can equip gems only after a certain level, that means that they do not stay with resets. Where do they end up being? Are they crusader-specific like items, or are they shared between all crusaders? Because I hope you know that in the latter case you need only ONE DPS gem, to give to your main DPSer (maybe you are new to the game, you only need one DPSer, the rest are there to support him/her), while HP ones are worthless and crit ones are easily exploitable (give a lvl 1 gem to 10 crusaders and it's a free 5% crit, which translates in a lot of damage thanks to the talent. Crit gems should therefore NEVER be combined until all your crusaders are equipped with a gem). Also, do you have to equip them manually every time? This thing alone would make most people just ignore them altogether, since nothing they give helps with quick resets (and most people DO quick resets, they reset the moment they stop instakilling enemies, if not before). Also, as I said, HP gems are totally worthless, since, again, if you are not instakilling stuff you are doing it wrong.

I understand you are excited by the game and think you ideas would be cool, but please try to think if they are feasible before suggesting them. I'm sorry to say you made two suggestions that you clearly didn't think through.

Still inherently imbalanced. While you only need ONE DPS gem, the crit and gold ones are better spread out evenly among all crusaders (that is, you never upgrade one until you STILL can equip all crusaders with gems).

But the main point is that this mechanic is needlessly complicated, since it ends up doing the exact same thing that idols do (more DPS and gold find), and in a very similar way too (you get gems with grinding, exactly the way you get idols). This suggestion would add nothing to the game in terms of gameplay.

Please, before throwing suggestions without thought, try to understand the basic mechanics of the game... I'd suggest at the very least to bring you idols count on the fourth digit (and a fifth would be even better), before you have the experience to discern wether your suggestions are potentially good or not.