The Crystal Heart resembles a huge, red, crystal structure, and Pearl stated that it's connected to the most dangerous parts of the temple. The center vein connected to the bottom of the Heart leads directly down into The Burning Room, via Rose's Room.
Steven gripped onto one of the blood vessels, and then slid down it while seeing into other rooms.
Amethyst and Steven attacked the escaped arms on its vessels.
- When Steven slides down the center vein, the middle area is Rose's Room, hinted by the primary tune played in the episode "Rose's Room" and because of the pink clouds shown.
- Smaller seemingly organic hearts that may be similar to the crystal heart can be seen inside the Injectors in "On the Run."
- It is rumored that the temple is a giant Gem and the crystal heart could be its heart.
- The Kindergarten Control Room (from "Marble Madness") and Gem Warship seem to have their own versions of the Crystal Heart.