Emerald Ore Recipe
This is a very rare block to encounter, and it spawns in very small quantities anyway. I would like to introduce a recipe so that it can be made, and this recipe would not be exploitable.
This recipe outputting 1 emerald ore would allow for more extensive use in decoration, as well as preventing any kind of gaming the system, as it requires the same amount of emeralds to produce as can even possibly drop from the ore. According to the wiki, emerald ore can drop up to 4 pieces at a 20% chance with fortune 3, this would mean that it is only possible to try and recoup the emeralds used to create it, but not get more than was put in originally.
I think this is a great idea. It is a tough natural decorative element to find. I think knowing you cannot get more out of it than you put in, makes it fair for me. At this point, I don't think anyone is mining emeralds ot buy books given we have such expansive villager halls for that.