Gemstone Walls

Gemstone Walls can be crafted at a Work Bench in the Graveyard Mini-Biome, or found naturally generated in the world. Naturally generated Gemstone Walls can be found in Gemstone caves in the Underground and Cavern layers. They can be destroyed with a hammer, but they will drop nothing, will not stop enemies from spawning, and cannot be used for proper housing. However, crafted Gemstone Walls can be used for valid housing, and will drop themselves if broken.

Trivia

 * Before 1.4.0.1, these walls could not be collected by a player, as they were exclusively naturally generated.