Wailing Stone

Wailing Stone is an artifact found by the gems in the episode "Rose's Room"

History
In the episode "Rose's Room" the gems found the wailing stone on their mission, when the stone is activated by pushing the button at the top it emits a ear-piercing sound that can cause things to break like the television screen.

Trivia
The wailing stone is said to reappear in a future episode called "The Message".