I always wondered why there isn't one for these two? I'm the only one who has done it (as far as I can see) and doesn't make sense on why this decision hasn't been added (aside of the Normal Difficulty). Below will show the idea (for Wave Ocean, I do also have a White Acropolis Run coming tomorrow)

The default is to have Gems for hard and very hard difficulty purely from tradition (following convention from TSC). We added the No Gems category since a lot of people seemed to enjoy running No Gems for Normal stages but we didn't add it for the others b/c there didn't seem to be enough interest.

I think the consensus among the mods is still that we don't really want to add more clutter to the IL leaderboards for categories that have little to no runners, but feel free to run them on your own.