Emerald

Emerald is an item which was added in Update 0.9.0. In Minecraft - Pocket Edition, it is currently only for decoration. And the item to trade Villagers in Update 0.15.0.

Obtaining
Emeralds can be obtained by mining Emerald Ore. They can also rarely be found in Village blacksmith chests, and rarely, Stronghold chests as well as Desert Temple chest.

Crafting

 * 9 Emeralds => 1 Block of Emerald
 * 1 Block of Emerald => 9 Emeralds

Trivia

 * In other versions, it is used for Trading.
 * It may gain this use in a future update.
 * Emeralds were added in an earlier update as well, but were removed.
 * Emeralds cannot be crafted into armor or tools.