Gemstones are the core components of any Gem. They appear as literal gemstones in various cuts, shapes, and colors located on a Gem's physical form.
Description
The gemstones represent as the Gem being itself. A Gem's physical body is a hologram with mass, as the gemstone acts like a power source or brain. If a Gem's physical form is badly damaged, they with retreat into their gemstones and regenerate.
Any damage the gemstone receives will results in interference with a Gem's control over their physical form and powers. Shattering a gemstone will prevent the Gem from regenerating completely, essentially "killing" them.
During fusion, gemstones will change color to match their partner's. Fusions of the same Gem type will create a larger version of themselves.
Multiple Gems with the same gemstone can exist. Gemstone placement vary from Gem to Gem, even if they are of the same gemstone. Gems having similar gemstone cuts is very common, especially if they come from the same Kindergarten. However, Gems of the same type can have other gem cuts as well. They are also able to summon different weapons.
Abilities
Gems can manifest, store, and retrieve various objects from their gemstones. The most important of them being their personal weapons and physical bodies. Gemstones can also create magical bubbles to put items in for safekeeping. They can also be used as power sources for technology or other magical objects.
Gem Bubbles have a stasis-like effect on gemstones. When a Gem is "bubbled", the gemstone is prevented from regenerating/manifesting its physical body or weapon. They are essentially imprisoned indefinitely until the bubble bursts.
Shards of gemstones will retain some of their powers. Thus, they have been used in various experiments including gem drones, sculptures, and objects. Because shards have partial sentience, they are hard to control. Grinding them up is a solution, but its power becomes weaker.
Culture
The gemstone is a core aspect of Gem culture. They are the source of a Gem's entire being, including appearance, shape, and abilities. The Gems are not only named after their gemstone, but are also recognized by it from other Gems. Because there is little differentiation among Gems, individuality is a rare concept. Serial numbers based on facets and cuts are the only definite way to tell individuals apart.
It also seems customary for a Gem to keep their gemstones exposed. Covering them up completely seems to bother them.
(Unfused) Gemstones
| Image | Location | Debut |
| Fire Agate's gemstone is located on the left side of her chest. It's a smooth cabochon cut with no facet. |
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| Hackmanite's gemstone is located on his chest. It's a circular cabochon cut with no facet. |
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| Heinrichite's gemstone is located on top of his head. It's tabular and asymmetrical. |
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| Kaolinite's gemstone is located on the back of her right hand. It's bumpy and visibly porous. |
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| Chevron Amethyst's gemstone is located in her right shoulder socket. It's a smooth cabochon cut with no facet. |
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| Yellow Jasper's gemstone is located on the back of her head. It's an arched cabochon cut. |
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| Cacoxenite's gemstone is located on top of her head. It's arched with jagged edges. |
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| Green Tourmaline's gem is located on the left side of her waist. It has multiple triangular facets and a circular center facet. |
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 | Pink Tourmaline's gem is located above her sternum. It's a six sided facet with an oblong-shaped center facet. |
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| Jet's gemstone is located on her forehead. It's smooth with no facets. |
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| Boulder Opal's gemstone is located on the top of her back. It has visible cracks on its surface. |
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| Petoskey Stone's gemstone is located on top of his head. It's a large fossil with circular patterns and jagged edges. |
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| Grape Agate's gemstone is located on her upper back. It has a botryoidal shape with four small crystals attached together. |
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| Conch Pearl's gemstone is located on her forehead. It's oval shaped with a flame-like structure pattern. |
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| Spirit Quartz's gemstone is located on his left arm and hand. It's a cluster of crystals with movable clawed fingers. |
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| Bronzite's gemstone is located on her upper back. It is a tapered baguette cabochon cut covered in brown and yellow speckles. |
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| Lavender Chalcedony's gemstone is located on the back of his head. It is a oval cabochon cut with gradient colors and dendrites. |
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| Pallasite's gemstone is located on her naval. It is a metallic, oval cabochon cut with colorful yellow crystals. |
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| Dendritic Agate's gemstone is located on back of her right hand. It is a triangular cabochon cut with the top half being beige and the bottom half covered by dendrites with a brown outline. |
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| Pyrite's gemstone is located on his nose. It;s a tapered baguette cut with no facets and an olive outline. |
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| Gedrite's gemstone is located on his spine. It's an upside down fan-like cut with eleven tube crystals merged together. |
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| Anthophyllite's gemstone is located on the back of his head. It is a fan-like cut with eleven cube crystals merged together. |
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| Desert Rose's gemstone is located on her sternum. It's a rosette shaped with multiple red crystals branching from the center. |
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| Rosebud Pearl's gemstone is located below her sternum. It has a bumpy shape that greatly resembles a rosebud. |
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| Tiger's Eye's gemstone was located on her right forearm. It was a brown and yellowed striped marquise cabochon. |
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| Hematite's gemstone was located in her right hair bun. It was a circular gemstone with no facets. |
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| Big Red Jasper's gemstone was located on her tongue. It was a red baguette facet. |
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| Crocoite's gemstone takes up their entire lower half. It is a tubular gemstone made of several red crystals. |
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| Chrysanthemum Stone's gemstone is located on their naval. It is an upside down tear drop gem with three white crystals. |
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 | Astrophyllite's gemstone is located on his eye. It is a wand cut with three yellow crystals going up diagonally. |
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| Imperial Zircon's gemstone is located on her chest. It is a rectangular shape and is faceted the same way. |
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| Snowflake Obsidian's gemstone is located on their left foot. It's a circular cabochon decorated with snowflake-like crystals. |
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| Boss' gemstone is located on her helmet. It's an octagonal facet. |
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| Broody's gemstone is located on the back of her left hand. It's an octagonal facet | ||
| Drilly's gemstone is located on her left foot. It's an octagonal facet. | ||
| Hearty's gemstone is located on her hest. It's an octagonal cut. | ||
| Plum's gemstone is located on her right foot. It's an octagonal cut. | ||
| TicToc's gemstone is located on the back of her right hand. It's an octagonal cut. | ||
| Turgite's gemstone is located on her back. It is made up of three metallic, circular crystals. |
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| Moss Agate's gemstone is located on her left shoulder. It is a white oval cut riddled with green inclusions. |
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| Aquamarine's gemstone is located on the left side of her head. It is a pale blue tear drop cabochon. |
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| Bloodstone's gemstone is located on her face and acts like a singular eye. It is an octagonal facet. |
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| Silver Blue Pearl's gemstone is located on the left side of her head. It is a baroque-shaped pearl with not facets. |
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| Azurite Geode's gemstone is located below her waist. It is a giant, polished, cracked open geode with azurite crystals inside. |
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| Blue Mussel Pearl's gemstone is located on her lower abdomen. It is an upside down arc shaped cabochon with no facets. |
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| Lapis Lazuli's gemstone was located where his nose would have been. It was a pear cabochon with white spots on a blue base. |
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| Cassis Pearl's gemstone is located in between the back of her head and hair bun. It's a round cabochon with a flame-like structure pattern. |
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| Charoite's gemstone is located where is nose would be. It is a pyramid cut. |
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| Quahog Pearl's gemstone before it was shattered. It was located where her nose would be. It was half embedded into her physical form. It was a purple drop shaped gemstone with no facets. |
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Fusion Gemstones
| Image | Location | Debut |
 | Pink Tourmaline's gemstone on Watermelon Tourmaline. |
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| Green Tourmaline's gemstone on Watermelon Tourmaline. | ||
| Sapphire's gemstone on Grape Agate. |
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| Fire Agate's gemstone on Grape Agate. | ||
| Fire Agate's gemstone on Poppy Jasper Rock. |
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| Onyx's gemstone on Poppy Jasper Rock. | ||
| Ruby's gemstone on Cherry Opal. |
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| Fire Agate's gemstone on Cherry Opal. | ||
| Blue Spinel's gemstone on Morado Opal. |
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| Fire Agate's gemstone on Morado Opal. | ||
| Fire Agate's gemstone on Bloodshot Iolite. |
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 | Kyanite's gemstone on Bloodshot Iolite. | |
| Fire Agate's gemstone on Sunshine Aura Quartz. |
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| Londonite's gemstone on Sunshine Aura Quartz. | ||
| Fire Agate's gemstone on Goldstone. |
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| Amber's gemstone on Goldstone. | ||
 | Pyrite's gemstone on Nuummite. |
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| Gedrite's gemstone on Nuummite. | ||
| Anthophyllite's gemstone on Nuummite. | ||
| Ruby's gemstone on Pineapple Opal. |
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| Sapphire's gemstone on Pineapple Opal. | ||
| Fire Agate's gemstone on Pineapple Opal. | ||
| Tugtupite's six gemstones are located on her helmet, chest, hands and feet. They are octagonal facets. |
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Forced Gem Fusions
| Image | Location | Debut |
| Tiger Iron's gemstone is located on its pupil. Its gemstone is three large gem shards artificially fused together with smaller crystals holding it together. |
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Cracked Gemstones
| Image | Location | Debut |
| Lavender Chalcedony's cracked gemstone. |
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Trivia
- Although the gemstone being exposed is largely cultural, given that some corrupted Gems have had them internally, Steven once expressed discomfort as a baby when his gemstone was covered.
