Block of Emerald

Blocks of Emerald (also known as Emerald Blocks) are mineral blocks that do not naturally generate in maps. Although their primary usage is decoration, they can also be used to store Emeralds compactly. To acquire a single Emerald block, one must craft a 3x3 emerald row in a crafting table. Reacquiring the Emeralds simply involves placing the Emerald blocks into the crafting grid.

History
On May 28, 2012, Jeb tweeted an image, featuring a room containing Redstone Lamps and Blocks of Emerald.

Blocks of Emerald were added in Snapshot 12w22a.