Jasper/History

Jasper is a quartz-type Gem created with the natural abilities to be a soldier loyal to her Diamond. She fought in the first war on Earth against the Crystal Gems and respected Rose Quartz's leadership and tactics. Thousands of years later, she is assigned by Yellow Diamond to be Peridot's escort to Earth while she checks on the Cluster and its prototypes.

Season 1
In "The Return", Jasper arrived on Earth with the mission of being Peridot's escort, assigned by Yellow Diamond, while she checks progress on the Cluster. Upon observing the Crystal Gems, Jasper believes that they are a waste of her time. Jasper then ponders where Rose Quartz is because she was looking forward to fighting her. Jasper proceeds to insult each of the Crystal Gems and tells Peridot to blast them with the ship because she believes that she can easily take them all on by herself. To Jasper's surprise, the Crystal Gems survive the explosion thanks to Steven's shield. Jasper immediately recognizes the symbol being Rose Quartz's. She asks Steven, thinking he is Rose, why he took the form of a human boy.

In response, Lapis Lazuli begs Jasper not to hurt him, which prompts Jasper to become enraged at Lapis for withholding information from her. Jasper then disregards the mission and wants to show Yellow Diamond what has become of "Rose". Garnet attacks Jasper, but Jasper summons her Crash Helmet and causes Garnet to unfuse using her Gem Destabilizer. She lifts up Steven by his shirt, still thinking that he is Rose, and mocks him, explaining how the Crystal Gems are weak and that Rose has failed. She headbutts Steven and places him, the other Crystal Gems, and Lapis, in jail cells on the Gem Warship.

In "Jail Break", while on the Gem Warship, Jasper tells Peridot that they are going back to Homeworld with the captured Crystal Gems and Lapis. Peridot disagrees, explaining to Jasper that the whole point of coming to Earth was to check progress on the Cluster. Jasper, once again, disregards the mission and tells Peridot that delivering Rose Quartz (Steven) to Yellow Diamond takes priority. Later, Jasper discovers that one of the imprisoned Gems is missing from her cell and finds Garnet in the center of the ship. Jasper is annoyed that Ruby and Sapphire are fused again, and she explains to Garnet that "fusion is just a cheap tactic to make weak Gems stronger."

Garnet and Jasper then begin fighting; Garnet dodges Jasper's attacks and breaks her destabilizer. Jasper then spin-dives at Garnet and causes both of them to fall through the deck and into the ship's engine room. While Garnet sings, she continues to fight with Jasper, once again dodging many of Jasper's attacks. Finally Garnet catches Jasper and throws her into the ship's main power source, causing it to explode. Jasper crawls out of the ship debris, obviously injured, and explains to Garnet that she only won because she is a fusion. Jasper catches Lapis when she tries to fly away and seemingly persuades her to fuse with her. Lapis agrees, and the two proceed to fuse into Malachite. However, Lapis chains up their fusion. Jasper struggles to escape, and Lapis drags them both to the bottom of the ocean.

Season 2
In "Chille Tid", when Steven enters Malachite's Realm, it is revealed that Lapis has control of the fusion. Steven being there, however, distracts Lapis, and Jasper momentarily takes control. Jasper appears tired, and when she notices Steven, she becomes enraged. She crawls to Steven repeating the word "you" and when she becomes close, she tries to grab Steven but is stopped by Lapis, who once again regains control.

Season 3
In "Super Watermelon Island", the civilization of Watermelon Stevens on Mask Island attempt to sacrifice one of their numbers to Malachite to stop the earthquakes that troubled the island. Thanks to Steven's vision of the event, the Crystal Gems track her down, and fuse into Alexandrite to fight her. Lapis finally loses control of their fusion with Malachite and Jasper takes over. She releases the chains that kept Malachite back and is ready to fight Alexandrite.

As Malachite, Jasper states, "You know you're right. There really is something more to this fusion thing! It's not just a cheap trick. You've really shown me a whole new world of possibilities!" Malachite is eventually defeated and forcibly defused by the Gems, with the aid of the Watermelon Stevens. Shortly after the fight, a Cluster-related earthquake takes place, creating deep fissures in the ground. Due to Jasper's unconsciousness, her body slides down. Pearl tries to catch Jasper, but she is too late to save her from falling into a crack.

In "Hit the Diamond", Yellow Diamond sends five Ruby soldiers to retrieve Jasper, due to failing her mission on Earth. It is revealed that she was considered the "leader" of the mission, much to Peridot's surprise. Peridot, unaware that her fellow Crystal Gems do not know Jasper's whereabouts, tells the Rubies that they know Jasper's location. Steven lies to the Rubies and tells them that Jasper is on Neptune.

In "Alone at Sea", Jasper follows Lapis while she is on a boat with Steven and Greg. Jasper makes multiple attempts to board the ship, such as pulling down and snapping the string off of the fishing rod to climb onto the ship while Lapis is fishing, and trying to force her way on, causing multiple loud bangs to be heard and making the ship's engine fail. Jasper finally climbs aboard via the anchor chain and expresses her joy to seeing Lapis again. When Jasper sees Steven, she recognizes that he is not Rose but a "dulled-down" version of her and thinks that he is working for Lapis.

Steven summons his shield to protect Lapis, but Jasper laughs it off and says that it should be the other way around since Lapis is much more powerful, as Jasper describes her to be a "monster". Eventually, Jasper aggressively hits Steven which flings him across the ship's deck. Jasper gets down on her knees and holds Lapis' hand, begging her to fuse with her again since Malachite was so powerful. Jasper acts manipulative, claiming that she changed, but Lapis rejects the offer. Steven sticks up for Lapis once more which causes Jasper to aggressively charge at Steven, but with quick reaction, Lapis shoots a water fist through the deck floor, hitting Jasper high into the air and far, far away to an unknown location, but perhaps near the Great North.

In "Gem Hunt", Jasper follows two Corrupted Gems in the Great North. She poofs one of them off screen, and later appears in front of Steven and Connie when they are in the middle of fighting a Corrupted Gem. Jasper brutally injures the monster, throwing punches to the face and slamming it to the ground by its tail. Jasper manages to poof the monster by forcefully pulling its gemstone from its body. Steven, Connie, and Pearl (who later shows up) are shocked to see Jasper. Jasper teases Steven, saying "Rose, look what I got", revealing both of the monsters' gemstones. Jasper then walks away until she cannot be seen in the snowstorm.

In "Crack the Whip", Jasper rises out of the ocean on the beach with her two monsters. Before Jasper rose to the surface, Amethyst defeats one of the monsters that appeared first, and Steven bubbles it. Once Jasper is on the surface, she is seen on top of the other monster with her Crash Helmet equipped. Jasper reveals to Steven, Connie, and Amethyst that her plan is to create her own army to rival Rose's (Steven's). Amethyst tells Steven and Connie to go after the monster and that she'll take Jasper herself. Jasper is amused, but is also disappointed because she wanted to fight Steven, and not a "runt". Jasper then brutally knocks Amethyst on the ground and rolls over her helpless body with a spin dash. Jasper becomes bored, and wonders why Amethyst isn't trying her hardest. She says Amethyst is a Quartz soldier like her, but she's defective, and Jasper says she lives to fight. Amethyst tells Jasper that Rose said she was perfect the way she is, and Jasper insults Rose by saying that statement is false, causing Amethyst to become furious. She spin dashes at Jasper, but Jasper easily stops it and manages to poof her by slamming Amethyst to the ground with her helmet. Jasper holds Amethyst's gemstone in her hand and was planning on shattering it.

When Steven and Connie saw what Jasper was going to do, they charged after Jasper and fused into Stevonnie. Jasper is surprised by the fusion, and after Lion launches the monster toward her, the monster tries to flee, but Jasper tugs it by the tail and mounts it. Stevonnie mounts Lion and Jasper is excited to face each other head-on. The two charge at each other, on their respective mounts, and at the last second Stevonnie jumps into the air, throws a shield at Jasper, forcing her to catch it, and they poof the monster with Rose's Sword. Jasper takes the monster's gemstone and tells Stevonnie that she will be back and Jaspers always get they want. She then slowly sinks herself into the ocean.

{{Stext| In [{"Beta"]], it is revealed that Jasper was created in the Beta Kindergarten halfway during the war when Homeworld needed to quickly grow more Quartz soldiers. She came out as the perfect Quartz, as described by Peridot. Later, Jasper is shown to have caged up a lot of Corrupted Gems behind metal bars in the holes of the Beta Kindergarten. }}