We should be able to use rankup gems like awakening gems, from the inventory
With all these different class and year gems, apparently the game can't handle letting you use the one you want to. It defaults to the most specific gem when choosing a champ to rank up. The way to solve this is let us use them like we use every other item, such as awakening gems, sig stones and arena boosts. I should be able to tap a rank up gem in my inventory, and it shows me champs I can use it on.