Even though we've already won the fight for Earth, we're still trying to keep it safe! There are battle-damaged Gems that are still around, and they're not like us. Something's really wrong with them. They're like horrible monsters. We have to poof their bodies away, and then keep their Gems inside of bubbles, so they can't form again and hurt anybody. Maybe someday I'll be able to heal what's wrong with them, but I'm not sure how. Mom couldn't fix them either. For now, we're keeping them safe inside the Temple.

Steven, "Guide to the Crystal Gems"

Corrupted Gems, also known as Gem Monsters, are Gems who have become corrupted, assuming a monstrous form. One of the main objectives of the Crystal Gems (other than their protection of humanity) is to defeat and contain corrupted Gem monsters, and hopefully cure them.[1]


All those monsters we fight used to be just like us! Right, Pearl?
Yes. But they've become corrupted and broken.

Amethyst and Pearl, "Ocean Gem"


Corrupted Gems used to be normal Gems before the events that unfolded at the end of the Rebellion. As a last ditch effort in the war for Earth, the Great Diamond Authority sent out a Corrupting Light which corrupted Gems from both Homeworld and the Rebellion that had been left on Earth. In "Monster Reunion", the Centipeetle Mother described it as a "song" and remembering it seemed to be what triggered her to revert into her corrupted form.

As revealed in "Earthlings," second-hand corruption can occur to a non-corrupted Gem through fusion with a corrupted one, as Jasper started corrupting after fusing with the Snow Monster and forming a semi-corrupted fusion.


It's sort of like if MC Bear-Bear didn't tear the fabric of his arm, but the fabric of his mind.

Garnet, "Monster Reunion"

The appearance of the Corrupted Gems varies greatly with different Gems, although in "Monster Reunion" multiple Centipeetle Mothers can be seen, hinting at the possibility that like Gems will take on the same corrupted forms. This is also supported in "Earthlings", in which several corrupted Jaspers can be seen having taken wolf-like forms. As the bodies of Gems are mental projections, the bodies of corrupted Gems are a reflection of how damaged their minds are. Forms range from slightly humanoid to monstrous, and in severe cases, not having a physical body.

Corruption sometimes also changes the physical appearance of a Gem's gemstone. As Centipeetle's gemstone had a curvy contour line that surrounded the circumference of the gem and upon partial healing by Steven, the curvy contour line straightened. Jasper's gemstone, however, wasn't changed by her corruption. Time may be a factor in this case - Centipeedle had been corrupted for several millenia, as opposed to Jasper, who had just undergone it.

Most corrupted Gems are hostile and dangerous and behave similarly to wild animals. Many of them will exhibit behaviors such as feeding and predation, despite not requiring sustenance. However, much like regular Gems, when their bodies are severely damaged, they explode into smoke, or "poof", leaving their gemstone behind. The gemstone can then be safely contained in a Gem bubble, preventing it from regenerating. Some corrupted Gems are imprisoned in objects (such as the Pyramid Temple's gemstone), which also prevents them from regenerating.[2]

Corruption also seems to strip gems of some of their basic powers. They are unable to summon their weapons or use warp pads and other Gem structures, such as a door to a spaceship.


Garnet simply describes corruption as a tear in the mind of a Gem, rather than physical damage on their gemstone and as such is harder to heal than a cracked Gem. There is currently no known way for reversing the effects of corruption.

Steven's healing spit only partially and temporarily healed the Centipeetle Mother, but she reverted to her corrupted form shortly after. Garnet acknowledges this as a major step in trying to heal the Corrupted Gems even though Steven's attempt had failed, saying that it was the best that they have seen it work. She indicated that Rose Quartz was unable to heal the Corrupted Gems to the same extent her son, Steven, had done.

Known Corrupted Gems

TV series

Comic book series

Steven Universe

Steven Universe: Too Cool for School

Steven Universe and the Crystal Gems


Monster Buddies 064
  • When regenerating, the Centipeetle Mother briefly assumed a humanoid shape – presumably reflective of her original form.
  • It is unknown how many of the corrupted Gems are former Homeworld Gems and how many are former Crystal Gems.
    • However, it can be assumed that the majority of corrupted gems were Crystal Gems, due to them not knowing about fleeing the earth.
  • Some corrupted Gems, such as the Worm Monster and the Centipeetle Mother, are shown to have an urge to eat food. The reasons for this are unknown, but it is possible that they do not gain sustenance from their gemstones as most other Gems do.
  • As shown by the Centipeetle Mother and her crew, it is possible for Corrupted Gems to be peaceful and even retain some aspects of their former personality, as Centi and her surviving crewmates retained their bond with one another, despite remaining corrupted.
  • As shown by the two Northern Gem Monsters from "Gem Hunt", Corrupted Gems are capable of feeling fear and their behavior indicates that Corrupted Gems may have a strong fight-or-flight instinct. This may suggest that Corrupted Gems are not innately violent or hostile, but instead possess a mentality similar to a wild animal, attacking and/or fleeing from perceived threats. This may also explain the Centipeetle Mother's passive behavior towards Steven and the Crystal Gems after reuniting with crew despite being corrupted, as she no longer saw them as a threat as she originally did in "Gem Glow".
  • In "Monster Buddies" and "Crack the Whip", it is shown that Corrupted Gems can in a sense be tamed, though with varying results. In "Monster Buddies", Steven was able to befriend and bond with the regenerated Centipeetle Mother. In "Crack the Whip", Jasper managed to tame the two Corrupted Gems she captured in "Gem Hunt", through the use of intimidation and physical domination. While seemingly effective at first, due to her method's cruelty, the two gems lack any real loyalty to Jasper as they followed her mainly out of fear of her and would abandon her if given a chance as shown in both "Crack the Whip" and "Earthlings".
  • Unreleased corrupted Gems can be seen on Guy Davis' Tumblr, such as the Stinger, the Fist Chest, and the Shell Back.[5]
  • Garnet's description of the difference between cracked and corrupted Gems in "Monster Reunion" is spot on. Where significant physical damage can represent gem cracking, Gem corruption could be representative of mental harm. The etymology of "schizophrenia" is "the splitting (or tearing or fracturing) of the mind"[6], a word that for years was used to broadly describe just about any mental illness until the 1970s when significant changes to how mental disorders are diagnosed were made. Schizophrenia does not imply that a person has multiple personalities. That diagnosis belongs to Dissociative Identity Disorder, which is a unique diagnosis and is often not related to schizophrenia. The most common mental disorders are anxiety disorders (including PTSD) and depression.[7] How the series will handle the issue of Gem corruption is still to be determined, but it is quite clear that it will be the topic of future episodes following "Crack the Whip".
  • Being poofed or put into an object can save a Gem from being corrupted by the Corrupting Light. It is unknown whether being trapped in an object or being poofed in general is what saved Lapis.
  • It is revealed in "Earthlings" that corrupted Gems are capable of fusing with regular Gems.
    • However, this will cause the uncorrupted Gem (as shown by Jasper's corruption) to become corrupted once the fusion is ended. It is currently unknown if corrupted Gems are capable of fusing with other Corrupted Gems.
      • It should be noted, however, that Jasper's corruption may have been amplified by her rage towards Rose Quartz, coupled with the fact that she had once again lost to a Crystal Gem fusion and had been abandoned by her fusion partner.
  • It is implied that Gems of the same type have the same corrupted form, as seen with Jasper, Biggs Jasper, and the Snow Monster, both of the Water Bears, and the Centipeetle Mother and her crew.


  1. Ocean Gem
  2. What Are Gems?
    Q: "How about the gem from the pyramid temple in Serious Steven? (Is it corrupted?)"
    A: "Yes, corrupted."
  6. Online Etymology Dictionary – Schizophrenia –
  7. Center for Disease Control and Prevention - "Burden of Mental Illness" -
ve Corrupted Gems

CentiNAV Wormmonster gemnav Obelisk gemstoneNAV Desertglas gemstoneNAV Gemcavecreature gemstoneNAV BirdNAV Heavenbeetle gemstoneNAV Earhbeetle gemstoneNAV Watermelontourmaline thumbnailNAV Icemonster gemNAV Invisiblegemmonster gemstoneNAV Lighthouse MonsterNAV Waterbear gemstoneNAV SlinkersGemNav Crabmonster gemstoneNAV BiggsJasperNavigation SMNav FusionTemplateJasperMonster NewJasperNAV UCGNav Flowergemnav Historical Friction monster template picture

ve Comic Gems
Adventure Time: 2013 Spoooktacular #01

Cobelisk Gem revision

Steven Universe (2014-2015)

CloudGemNAV MantaNAV SlugNAV OldBookNavJ23 SnowBeastNAV PlantGemNAV ClockNAV

Steven Universe (2017-2018)

RedBirdNAV RedEelGemNav ComicLizardGemNav Molegemnav Frozen Fragment Scorching Shard

Steven Universe and the Crystal Gems

GlassNAV Antgemnav



Steven Universe: Too Cool for School


Start a Discussion Discussions about Corrupted Gems

  • Gemless "Babies"

    5 messages
    • We have already seen this in uncorrupted gems, specifically Pearl's holo-pearls. It seems likely that the corrupted gem "babies&qu...
    • I agree that they're probably similar to holo-pearls. The alternates made usually aren't as powerful and are made for a use, w...
  • Watermelon Tourmaline

    49 messages
    • KinguvX wrote:Yes, and I promise you I will do anything in my power to get President. Even if it involves murd- I mean talking to the other peo...
    • No.. Flowers for their loved ones- I mean themselves.