On the run 21

A shot of the Prime Kindergarten and several Injectors

Kindergartens are facilities that serve to create Gems by using machines called Injectors.



In order to expand the Gem Empire, the Diamonds select planets to colonize. These planets will have Kindergartens set up on them by Homeworld Gems to complete this goal. 

The locations of Kindergartens are mainly selected based on the material making up an area; areas with richer resources will create standard Gems while areas made up of lesser resources will create Gems with defects. Once a location is chosen, the area is altered by Gems so that Injectors are able to be placed upon the walls of the location. As the name implies, these Injectors will inject goo into an empty space on the wall. The goo will then drain its surroundings of its life force in order to grow and develop. Once a Gem is fully grown, its gemstone will harden and the Gem pops out of the wall, leaving behind an exit hole.

Code Identifiers

Because there are so many types of the same Gem, Homeworld created a system where Gems are given a code to identify themselves. This code is based on the Kindergarten where the Gem was made. For example, if Amethyst was a part of Homeworld society, she would be known as Amethyst Facet-5 Cut-8XM. Facet 5 is there because that is where the Prime Kindergarten is located (Amethyst was made there), and 8XM is the name of the spot where her exit hole is located. According to Peridot, the code given to exit holes go from top to bottom, so if 8XJ was at the top of the wall, 8XK would be beneath her, and so on.

Variables Which Alter Gems

There are many variables which alter a Gem's appearance when they emerge from a Kindergarten:

  • Prolonged incubation: If a Gem remains incubating in the ground longer than they are supposed to be, they will emerge shorter than they are supposed to be. Amethyst is a notable example of this.
  • Material in surrounding area: Certain spots where goo is inserted into the planet may be made of different material than other areas of the Kindergarten. This can cause a Gem's physical form to have certain characteristics. For example, Peridot was able to tell that Amethyst Facet-5 Cut-8XJ had curly hair based on the iron deposits in her exit hole. 
  • Geography: The Beta Kindergarten was set up in a location where there were lumpy hills made of sandstone. Because Homeworld did not take the time to properly alter the geography to their needs, Gems emerging from the deformed land came out defective. Only Jasper came out properly because of the frictional rock melt and glass located at her exit hole.


The establishment of a Kindergarten saps the life force from its surroundings. When a colony is completed with multiple Kindergartens established globally, organic life becomes extinct on that planet. Even though the colonization of Earth was never completed and only two Kindergartens were established on the planet, life has still been unable to reestablish itself where they are located, thousands of years later.

Known Kindergarten Facilities


  • "Kindergarten" means "children's garden" in German and it usually refers to a place of preschool education. In this case, it literally means a garden where 'children' are grown. In "Know Your Fusion", Sardonyx makes a reference to the former, joking that "[Jasper] should've gone back to preschool!"
  • The person-shaped holes on the sides of the Kindergartens, as well as the manner in which Amethyst slid into hers, appear to be inspired by the Junji Ito horror manga, The Enigma of Amigara Fault.
  • The Injectors resemble bacteriophages. This alludes to the fact that when a bacteriophage or just any virus invades another cell, the cell will just create more viruses until it is destroyed, much like how when a gem is inserted into the ground by the injector, the ground will become barren and lifeless.
    • The body of the Injector rig encases a structure that resembles an organic heart, which is attached to the head and feet via red and blue tubes resembling arteries and veins, respectively.
  • As revealed by Peridot in "Too Far", Gems that stay in the ground for too long have stunted height when fully grown. An example of this would be Amethyst.
  • In "Beta", Peridot revealed some details that make a quality Kindergarten/Gem hole.
    • The surfaces must be flat (curved surfaces result in Gems emerging sideways).
    • The holes must have even spacing and consistent depth.
    • The Gem must not come out of the hole at an angle and leave a strong clean silhouette.
    • Exceptionally good quality holes have frictional rock melt, and glass all the way to the back.
  • "Now We're Only Falling Apart" marks the first time Gems are seen emerging from a Kindergarten. First, a section of cliff face begins to glow brightly in the shape of the emergence hole before bursting open, allowing the Gem to exit.
  • The majority of Kindergartens are named after letters of the Greek Alphabet. Beta is the second letter, Delta the fourth, and Zeta the sixth. Interestingly, the first Kindergarten on Earth is referred to as the "Prime Kindergarten" and not "Alpha Kindergarten."

ve Locations
Beach City Businesses: Aqua-MexicanBeach City Funland (Funland ArcadeWiener in Hand/Hot Dogs) • Beach Citywalk FriesBeach City WoodsBig DonutBuddwick Public LibraryClassic ThymeCrab ShackDanny'sFish Stew PizzaIt's a WashMini-Golf CourseSpacetriesSuitcase Sam'sT-Shirt ShopU-Stor

Residences: The BarnBarriga ResidenceBeach HouseMiller ResidenceOnion's House
Other: Abandoned WarehouseBeach City PierBeach City StageBeach City WoodsBrooding HillDead Man's MouthLighthouseMayor's OfficeUnderwater SwordWater Tower

Crystal Temple and the Beach House Amethyst's ChamberAmethyst's RoomBurning RoomCrystal HeartGarnet's ChamberPearl's ChamberPearl's RoomRose's RoomSteven's BathroomSteven's ConservatorySteven's RoomSardonyx's Room
Other Earth Locations Canada • Cool RanchDelmarva (Charm City • Ocean Town • Wilmington) • Dhawar • Empire City (Le Hotel) • Ghana • HospitalJerseyKeystone (Keystone MotelThe Best Diner in the World) • Korea • Maheswaran Residence
Gem Locations Earth: Ancient Gem Colony ShipAncient Sky ArenaBeta KindergartenCloud ArenaCommunication HubDesert (Rose's Landfill) • Flower MeadowForgeGalaxy WarpGem BattlefieldGeodeGreat NorthIce CavernKindergartens (BetaPrime) • Little HomeworldLunar Sea SpireMask IslandPearl's ArenaPearl's TreePrime Kindergarten (Prime Kindergarten Control Room) • Pyramid TempleRose's FountainRose's Secret ArmorySand FortressSea ShrineSky Spire

Earth's Moon: Earth Moon Base
Jungle Moon: Jungle Moon Base
Gem Homeworld:Blue Diamond's Pool ChamberKindergartenKlavius 7Pink Diamond's PalacePrison TowerThrone RoomUpsilon 9Yellow Diamond's Extraction ChamberYellow Diamond's Bubble Room
Other: Garnet's RealmMalachite's RealmPearl's DimensionPink Diamond's GardenPink Diamond's ZooPink DimensionThe ReefUnknown Beach planetUnknown City planetWarp Space

Attack the Light Beach City • Beach House • Crystal Temple • the Desert • Indigo CaveRed Temple • Strawberry Battlefield • Sunken Lunar Sea Spire
Save the Light Ancient Sky Arena • Astral Plane • the Barn • Beach City • Beach City Woods • Beach House • Crystal Temple • the Forge • Gem Battlefield • the Great North • Hessonite's Warship • Secret Temple of Secrets
The Phantom Fable Abandoned Ward • Arcane Acropolis • the Barn • Beach City • Beach City Woods • Buried Bastion • Delta Kindergarten • Forgotten Forest • Library 9
Comic Locations Canary CoveClock TowerEmpire City Wildlife Rehabilitation CenterMoors of MarcoonUniverse Family Camping Ground
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