Minecraft Villager Trading Hall - 26 Villagers - All Trades 1 Emerald. The trading system is a gameplay mechanic that allows players to trade principally emeralds for items (and vice-versa) with villagers, as well as wandering traders . Contents 1 Mechanics 1.1 Economics 2 Non-trading villagers 2.1 Nitwit 2.2 Unemployed villager 3 Java Edition offers 3.1 Armorer 3.2 Butcher 3.3 Cartographer 3.4 Cleric 3.5 Farmer.