Minecraft wiki entry for Trading, associated text: All transactions involve emeralds. Villagers buy or sell goods for emeralds, and wandering traders sell items for emeralds, but do not buy items. Trading is the only legitimate method of acquiring the globe banner pattern, woodland explorer maps and ocean explorer maps in Survival mode. It is also the only renewable way to obtain bell, diamond gear[1], lapis lazuli‌[BE only], bottle o'enchanting, glass, brick‌[BE only], terracotta‌[BE only], sand, red sand, coral blocks and small dripleaves.