Crystal Gem Apple is an apple that Tree Trunks wants the most. Once eaten, it will teleport the eater to Crystal Dimension, where the person will become the ruler of the place. In "Tree Trunks," it is shown that the apple lies deep in the Evil Forest and is guarded by a Crystal Beast. It grows on a mushroom-shaped tree and lies in the middle of the tree surrounded by branches. It also appears in "Crystals Have Power," as a flashback of Tree Trunks and Jake. Tree trunks, the one who had eaten it, is still the queen of the Crystal dimension.
The apple looks like a crystalized normal apple. Its leaves looks like normal leaves. It is red in color.