Minecraft wiki entry for Villager_(old), associated text: Right-clicking a villager will allow a player to trade with them, and display their career. Villagers will make offers based on their profession and career, and will only make trades based on whatever offers they are making. Different offers may be viewed by pressing the left and right buttons next to the currently displayed offer. All offers involve emerald as a currency, and some item pertinent to the villager's profession and career. Trading allows the acquisition of rare items that would otherwise be fairly difficult to obtain, such as chain armor. The trading mechanic allows players to get bottle o' enchanting in survival mode. When villagers get a new trade, pink particles and green cross particles appear.