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Garnet: We need to be bigger.
Steven: Then let's fuse, all four of us! It's the only way we're gonna get up to her head!
Amethyst: I'm in!
Pearl: I'm in, too.
Garnet: Then it's decided. It's time to form Obsidian.

—Garnet, Steven, Amethyst and Pearl before forming Obsidian, "Change Your Mind"


Obsidian is the fusion between Garnet (by extension, Ruby and Sapphire), Amethyst, Pearl, and Steven Universe. They made their debut in "Change Your Mind".

Appearance Edit

They're huge!

Peridot, "Change Your Mind"

Obsidian has an appearance similar to that of other Obsidians, being very large with eight arms, two faces, and a fiery design. They have carbon gray skin with orange markings, long black hair with orange streaks, four orange eyes, a pointy nose, and defined lips. Their gemstones are located on their forehead, chest, navel, and upper palms and are black in color.

They do not appear to wear any clothes.

Personality Edit

Obsidian does not appear to have a distinct personality, as they are shown to be always silent. The only noise they make is a loud roar after their formation.

Abilities Edit

Obsidian possesses standard Gem abilities and traits. As the fusion of all 4 core members of the Crystal Gems, Obsidian is the strongest fusion so far in the series.

Skillset Edit

  • Greatsword Proficiency: Obsidian forms the hilt of their sword by combining Pearl's spear, Steven's shield, Garnet's gauntlet, and Amethyst's whip; then, Obsidian smelts the blade of the sword by opening up a third mouth full of lava and sticking the hilt into their mouth. The red-hot sword that they pull out of their mouth is then capable of slicing through nearly anything, as it destroys Yellow Diamond and Blue Diamond's ships with seeming ease.

Unique Abilities Edit

  • Pyrokinesis: When Obsidian was eventually formed, their eyes (and in their mask) ignited fire. 
  • Lava Generation: Obsidian's third mouth is filled with lava, which they use to craft their sword.

Trivia Edit

  • The fact that Obsidian has the ability to create/hold lava within their body may be a reference to the fact that, in real life, obsidian is a type of volcanic glass that is formed when felsic lava cools.
  • Obsidian bears a resemblance to Te Ka from Moana.
  • The name of Obsidian was first seen in the Steven Universe: Art & Origins book.
  • Obsidian's sword resembles the Flameblade from The Legend of Zelda: Breath of the Wild, both in shape and the geometric designs on its surface.

Gemology Edit

Fire obsidian

Gemstone Information


  • Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
  • It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava.
  • The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth.
  • Obsidian is hard and brittle; it, therefore, fractures with very sharp edges, which were used in the past in cutting and piercing tools, and it has been used experimentally as surgical scalpel blades.

Gemstones Edit

Image Description
Pearl Obsidian Gemstone
Pearl's gemstone on Obsidian.

Obsidian circular
All other gems on Obsidian.
ve Fusion Gems
Crystal Gem Fusions
Double Fusions

Garnet Navbox Opalnav Rainbow II Nav Rainbow Quartz nav Stevonnie nav

Smoky Quartz nav Smoky Quartz RoseQuartz TangerineNavbox Prehnite Navbox Fluorite N


Triple Fusions

Sardonyx nav Sugilite nav Cherry(Steven)Navbox Cherry(Rose)Navbox


Quadruple Fusions

Alexandrite nav


Homeworld Gem Fusions
Double Fusions

Topaz canon Navbox Cinnabar Navbox


Cross-Alignment Gem Fusions
Double Fusions

Malachite nav Turquoise N Iolite Na Spirit Quartz Navbox RainbowArmQuartz Nav Dianite Nav


Triple Fusions

Chrysoprase Nav Larimar Nav Lav(Rose)Navbox LavNavbox Maxixe Nav PastelMomNavbox


Spinel Nav Tiffany Stone Nav Peach-nav Musgravite nav Spectrolite nav Blue Lace Agate Nav


Quadruple Fusions

DVA Nav


Unaligned Gem Fusions
Double Fusions

AzoticTopazNavbox Moonstone (Off-Color) Navbox MoonNavbox Rhodonite nav Teal Pearl Navbox


Triple Fusions

Morganite Navbox Rubellite Navbox


Quadruple Fusions

Lepidolite Navbox


Sextuple Fusions

Fluorite nav


Octuple Fusions

Jelly Opal Navbox

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