+1. Since they are making so many changes, they could simplify this gem by giving it damage on all maps. It would be nice to have another farm like this, there is even 1 vendor that sells you recipes to modify the normal jewels in order, something expensive but they could also add elixir to get more of this jewels in mausoleum and things like that. I would also add other jewels combined as well.
On the other hand mauso is a dead map that has almost no drop, it does not make sense to have a special jewel, with bonuses only for this map. Besides that it is quite weak with the latest expansions.