—Lighthouse Gem Monster, "Horror Club"

The Lighthouse Gem Monster is a formerly Corrupted Gem that first appeared in "Horror Club". She is notable for possessing the Lighthouse.


She consists of a gigantic mouth grown on the wall with Lars' name on it.


"Horror Club"

She was trapped inside a wall in the Lighthouse.

When Lars and Ronaldo were young, Lars carved his name in one of the walls. In response, the Gem loosened a plank from the wall and smacked Lars with it. Ronaldo took a photo of this event, intending to use it as evidence of the Lighthouse's possession, but Lars feared embarrassment and tore up the photo. The Gem recorded Lars' and Ronaldo's falling out.

Years later, Steven, Lars, and Sadie went to the Lighthouse and watched a movie with Ronaldo. The power in the Lighthouse went out, likely due to the Gem. Ronaldo suspected a ghost and brought out a pendulum. The Gem sent the pendulum flying into Lars' face, then she lifted many folders from a filing cabinet which circled the humans. After throwing a few more objects at the group, she tried to trap them by forcing the only door shut, but they managed to charge through it. They attempted to exit the Lighthouse, but the Gem attacked them using scarecrows which were placed outside by Ronaldo earlier. The group forced out the scarecrows and shut the door, leaving themselves inside the Lighthouse.

As the group argued amongst themselves, the gem drew back some floorboards from under Sadie, causing her to fall in the basement, then she closed the floor. She opened a trapdoor for Steven, Lars and Ronaldo to enter the basement.

Inside the basement, the group saw the Gem's physical form, which grew a mouth right before their eyes. Ronaldo attempted to sacrifice Lars to the Gem by throwing him into the mouth, hoping to rescue Sadie. Steven jumped in to protect Lars; as the Gem tried to bite into the two, Steven formed his bubble shield and forced the Gem's teeth back, and this destroyed her mouth and physical form. Sadie was unharmed, and as she emerged from the mess, she pushed out the gemstone on to the floor. Steven picked up the Gem, and she immediately played back her recording of Lars and Ronaldo.

After watching the recording, Steven bubbled and stored the gemstone. Sadie and Steven understood that the Gem felt hurt by Lars' carving, and that her aggression came from being trapped for a long time.


  • Possession: She has the ability to possess, although it is unknown if this ability is limited to inorganic or non-living matter.
    • Host Body Manipulation: While possessing the Lighthouse, she was able to manipulate different parts of the building, like forming flesh-like matter and a mouth on the basement wall.
    • Partial Possession: She has many paranormal-like abilities, such as possession of inanimate objects like scarecrows and fake bats, meaning she is not limited to only the lighthouse, but nearby objects or items touching it.
  • Telekinesis: She carries the power of telekinesis, which is shown when she was able to levitate and throw objects inside the Lighthouse.
  • Memory Projection: She has the ability to project recordings of past events she has witnessed, just like Pearl. This also bears a resemblance to Lapis Lazuli's photographic memory-like ability to replay past events as seen in the episode "Mirror Gem".
  • Hologram Projections: The Lighthouse Gem Monster can project holograms like an un-Corrupted Gem, with enough skill to create accurate "playbacks" of past events from memory.

Episode Appearances


  • She's capable of projecting recordings of events that she has witnessed, similar to Pearl's ability to project holograms, and Lapis Lazuli's ability to record events she has witnessed through the Mirror she was trapped in. It is the first (and so far only) Gem Monster to demonstrate this ability.
  • She is the first Gem Monster to possess the ability to talk. However, her speech is faint and disorientated.
  • She is the first Gem Monster to target a specific individual, with Lars being that individual.
  • It's questionable if she is Corrupted as she hasn't been seen using a form. However, the big mouth might have been her form, which would explain the mouth poofing.


Image Description
The Lighthouse Gem Monster's gemstone doesn't have a known physical location. Her gemstone has triangular facets and a circular center facet. This gemstone resembles those of Topaz, with the only difference being color.

A full view of The Lighthouse Gem Monster's gemstone, which resembles that of White Diamond's, though with a flat pavilion instead of a pointed one.



"Horror Club"

"Growing Pains"



ve Corrupted Gems

CentiNAV Wormmonster gemnav Obelisk gemstoneNAV Desertglas gemstoneNAV Gemcavecreature gemstoneNAV Big Bird Nav icon Heavenbeetle gemstoneNAV Earhbeetle gemstoneNAV WTorm Navbox Stereo Icemonster gemNAV Invisiblegemmonster gemstoneNAV Lighthouse MonsterNAV Waterbear gemstoneNAV SlinkersGemNav Crabmonster gemstoneNAV Corrupted Biggs Jasper Nav ico Snow Monster Nav icon FusionTemplateJasperMonster Corrupted Jasper Nav UCGNav Flowergemnav Historical Friction monster template picture

ve Characters in Steven Universe
Crystal Gems Human-Gem Hybrids: Steven

Unfused Gems: AmethystBiggs JasperBismuthLapis LazuliLarimarPearlPeridotRubySapphireSnowflake Obsidian
Gem Fusions: AlexandriteCrazy Lace AgateGarnetMega PearlObsidian (Rose Quartz Fusion)OpalRainbow QuartzSardonyxSugilite
Hybrid Fusions: Obsidian (Steven fusion)Rainbow Quartz 2.0Smoky QuartzStegStevonnieSunstone
Inactive Gems: Rose Quartz
Humans: Connie Maheswaran
Pets: LionPumpkinCat Steven

Homeworld Gems Unfused Gems: CombyEmeraldPebblesPeridotsSapphiresSpinel

Fusion Gems: MalachiteTopazZebra Jasper (fusion)Giant RubyRuby (triple fusion)Lemon JadeBluebird Azurite
Inactive Gems: Pink Diamond

Off Colors Unfused Gems: PadparadschaRutile Twins

Fusion Gems: FluoriteRhodonite
Humans: Lars Barriga

Other Gems (Formerly) Corrupted Gems: Angel Aura QuartzBig Bird • Biggs Jasper • BixbiteBlue Lace Agate • Cherry Quartz • Desert GlassEarth BeetleFlower MonsterGem Cave CreatureHeaven BeetleInvisible Gem Monster • Jasper • Lace Amethyst • Larimar • Lighthouse Gem Monster • Nephrite • Ocean JasperOrange SpodumenePlant MonsterPyramid Temple GemThe Slinker • Snowflake Obsidian • Tongue MonsterUnknown Giant Gem MonsterWater BearWatermelon TourmalineZebra Jasper (singular)Others

Other Gems: Minor GemsUnknown Gems (Morganite • Nephrite-XJ Cut-763 • Unknown Quartz Warrior • Blue Diamond's Court • Pink Diamond's EntourageUnknown Crystal Gems67 Elite CitrinesPyritesHessonites, Demantoids, and PyropesKyanites)

Gem Fusions: Cluster Gems (The Cluster)

Comic Gems: Ant Gem MonsterClock Tower GemFrozen FragmentGlass GhostInvisible Manta RayMole Gem MonsterMolluskMonster Lizard GemObeliskOld Book GemPlant MonsterPerils of PweepweeRainbow Cloud MonsterRed Bird Gem MonsterRed Eel MonsterScorching ShardSlime Gem MonsterSlug MonsterSnowbeastTentacle MonsterUnknown Giant Bird

Other Major Characters Humans: Greg UniverseSadie Miller
Recurring Characters Humans: Andy DeMayoBarbara MillerBill DeweyBuck DeweyBuddy BuddwickDante and Martha BarrigaDoug MaheswaranDr. Priyanka MaheswaranHarold SmileyJamieJaneJenny PizzaKevinKiki PizzaKofi PizzaMartyMr. FrymanMystery GirlNanefua PizzaOnionPeedee FrymanQuentin FrowneyRonaldo FrymanShepSour CreamSuitcase SamVidaliaYellowtailZoomans

Other: Baby MelonBlue CrabCactus StevenHolo-PearlMagic MossSteven Jr.Watermelon Stevens

Minor Characters Humans: The Best Diner in the World's WaitressEmpire City Wildlife Rehabilitation Center EmployeeGaryGreg's family (Aunt and Uncle • Aunt DebGrandfatherParents) • Hospital Employees (Dr. GeroDr. StrombergDr. West) JeffKhajima, Jaime, and BrandishMarty's RoadiesMayoral BodyguardsMike KrolOnion's Friends (Garbanzo • Pinto • Soup • Squash) • Patricia and DanielRickySabinaSteven's BabysitterSunshine JusticeWilliam Buford BuchananWilliam DeweyMinor Human Characters

Other: Blue CrabsButt LobsterCrystal BasiliskDogMask Island FishOnion's MouseOnion's SnakeParty GuyRaccoonSeagullsSnakeSteven The ThirdSusanMinor Animal Characters
Aliens: Beetle AliensBird Blob AliensUngulate AliensWorm AliensFlower-Like AliensMinor Alien Characters

Fictional Characters Cookie CatDogcopterMearlPizza JennyMinor Fictional Characters

Camp Pining Hearts: PaulettePercyPierre
Garnet's Universe: FoxmanHopperHoppyRingo
Golf Quest Mini: AceAce's Father
Li'l Butler: Li'l ButlerMr. MoneyMrs. MoneyDaughter Money • Dirtbike Money
Lonely Blade: Evil JanitorLonely BladeLonely Blade's Brother
Rose's Room: Cloud ConnieTiny Floating Whale
The Spirit Morph Saga: ArchimicarusLisaPlinkmanWind Lizard

Antagonists CentipeetlesCrab MonstersCrystal ShrimpDrill ParasitesElectric SkullsFryboRed EyeRobot Shooty ThingSmoke MonsterVine Monsters
Alter Egos Billy Bank AssetsChunk TruckConcrete HeatDashing Danny DooberHandsome Hank HackleschmidtHowl JonesLoch Ness BloggsterPurple PumaSea WaspShark-O-ManiaTiger Millionaire
Attack the Light Blue LightGreen LightIndigo LightOrange LightRed LightViolet LightWhite LightYellow Light

Groups: Light ArmyBlue Monsters • Green Monsters • Indigo MonstersOrange MonstersRed Monsters

Save the Light Hessonite • SquaridotHessonite's Citrines
Unleash the Light DemantoidPyrope
The Phantom Fable Fable • Lonely PearlJasper (Eyeball)
Groups Cool Kids • Crystal GemsCrystal Temps • "Famethyst" • Great Diamond Authority • Homeworld Gems • Hospital EmployeesOff ColorsOnion's FriendsPebblesSadie Killer and the SuspectsSecret Team • Steven and the Stevens • Water ClonesZoomansMinor Human CharactersMinor Animal CharactersMinor Fictional CharactersMinor Gem CharactersMinor Corrupted GemsSpeciesUnknown Gems
Gem Types Aquamarines • BismuthsDiamonds • GarnetsJades • Lapis Lazulis • Nephrites • Pearls • PebblesPeridots • Quartzes • Rubies • Sapphires • Topazes

Start a Discussion Discussions about Lighthouse Gem Monster

  • Is a Blue Topaz i think

    3 messages
  • Coincidence?

    20 messages
    • Nearhza wrote:Killuminati212 wrote:DaviBRSparkle wrote:1. She still isn't a diamond because her gem isn't in the shape of a diamo...
    • DaviBRSparkle wrote:Nearhza wrote:Killuminati212 wrote:DaviBRSparkle wrote:1. She still isn't a diamond because her gem isn't in ...
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