Ancient Gems, Health Items, Battle Items, Monster Boxes, Held Items, Main Items, Transformation Items, MT Moves, AI Moves
Ancient Gems or arena badges are the reward you will gain from defeating Ancient Sages/arena leaders in each Arena. Not much is known about the future use of Ancient Gems.
Each Ancient gem gives 10526 Rank points (rounded down). That means that all 19 gems gives you 200000 points.