Gems can summon special "weapons" from the gemstones on their body. Each Gem has their own method for retrieving their weapons, which they each try to teach to Steven in the first episode. Although he is unable to call his weapon at will, it was revealed as a shield. All the weapons have glowing parts that seem to be made of the wielder's stone. When "pulling" a weapon the user puts their hand to their gem and literally pulls it from the gem. When summoning a weapon the weapon forms in or around the user's gem. Garnet and Steven cannot pull their weapons. Pearl and Amethyst been seen summoning their weapons multiple times. Pearl, Steven and Garnet's weapons are summoned around their gems, Amethyst's weapon is summoned in her hands.
Garnet is the only member of the team to regularly dual-wield her weapon, as her weapon comes in a pair and she has two gems (one on both palms). Her gauntlets cover her whole hand and her wrist in a bulky dark red and light red cover with the underside of the base, where the sockets are, having a yellow star pattern. The fingers are red becoming black at the tips. Both gauntlets have knuckles embedded with light red garnets, which are strong enough to easily break through rock. Both of her gauntlets are adorned with a yellow star at the back hand area.
She summons them by mentally connecting with the energy of the universe and channeling it through her gems, the gauntlets then materialize from her gems. She can also use them as rocket fists as seen in "Watermelon Steven".
Pearl wields a spear that consists of a glowing pearlescent blade with similarly colored pommel and a white grip. The blade is wrapped around the grip, only opening when she grabs it. Her weapon seems to have three forms; a wand form but later transforming into the spear form, and Opal's bow and arrows when fused with Amethyst's whip.
To summon it, Pearl trusts in her years of precise training, puts her hands near her forehead, and pulls her weapon from the gem. In "Together Breakfast," her weapon was destroyed by the Evil Spirit, but in the next battle, she was able to summon another. Pearl is seen dualing her weapon in "Ocean Gem". In the episode "Watermelon Steven" her spear is revealed to have a range attack in where her spear, in its wand form, shoots an energy blast.
Amethyst bears a multi-tailed violet whip. Her whip has a purple amethyst as the handle knot and the handle itself being purplish grey. The whip has a cross-guard in the form of a white star. The lash is dark purple which divides into three different lashes that ends with an amethyst each to maximize damage. Multiple small sharp pieces of amethysts are embedded on the main lash so it can cause more damage and makes it harder to get away from a bind.
Amethyst summons her weapon with confident nonchalance by putting her hand close to her chest and simply pulling it from the gem. Like Garnet, she can wield two weapons as seen in "Together Breakfast." It's also known it can cut through metal and other materials. In "Ocean Gem" and "Coach Steven", it was shown that the whip can stretch long distances and is durable enough to lift boulders and support Sugilite's flail, as seen below.
Steven wields the only defensive weapon, a spiraling pink shield. His shield also shoots off the beam attaching it to the gem and sends the disc flying. It's shown that the spiral has thorns on it, and the center of the spiral itself is shaped like his gem. It appears to generate a sound wave that interferes with magic when struck, as shown when it disrupted Lapis Lazuli's control over her water constructs in "Ocean Gem."
In "Bubble Buddies," he accidentally activates his gem and creates an indestructible bubble shield. Not much is known of the abilities of this weapon or the way of summoning it. The bubble shield also seems to be rather heavy despite its size and thickness, given that when Steven and Connie fell into the ocean they sank very fast. However, in "Lion 2: The Movie", Steven's bubble shield was destroyed for the first time by a fireball shot from a robot. In "Island Adventure" Steven's bubble popped while running from the monster meaning that when he is startled his bubble is weaker
It is also possible that the desire to protect what he loves and when he feels a passion for something summons his weapon or gem. For example, when Steven ate his Cookie Cat and wanted to preserve them, his gem glowed, or when he saved Connie, Steven's supposed love interest.
On Matt Burnett's tumblr, it was confirmed Steven wields his mother's shield. Whether the surprise of the Gems first seeing the weapon was due to Rose never summoning her weapon or due to something else is unknown.
Opal's weapon is a opalescent long bow that fires arrows made of energy, and the bow is roughly as tall as Opal herself. Due to Opal being a fusion of both Amethyst and Pearl, she can summon either Amethyst's whip or Pearl's spear, with the latter's weapon being the body of the bow while the former's weapon becoming the string. She crosses and fuses both weapons together to form her bow. Opal's arrows seem to be made of energy, and are summoned when the bow is drawn back, these arrows cause a large explosion and give off a large amount of light on impact. The arrows are also capable of exploding/splitting into multiple smaller arrows to attack multiple targets at once. Targets can also have their remaining gems bubbled after being pierced by these arrows.
Sugilite's weapon is a giant flail. When Garnet and Amethyst fuse into Sugilite, they can also fuse their Sugilite's flail weapons (a pair of gauntlets and a whip) into a giant, dark purple flail. A longer version of Amethyst's whip acts as the supporting strand for the flail and a giant, fused version of Garnet's gauntlets acts as the bludgeon. The bludgeon (the fused gauntlets) is adorned with a silver-colored ring, shaped like a star, that connects the bludgeon to the whip-like part of the flail. Sugilite's flail can be swung around to cause mass destruction, crushing all opposition with the massive bludgeon. When used properly, the flail can smash hundreds of pillars into rubble in minutes. When using her weapon she throws it (with her two left hands as appose to spinning it first) and uses it's momentum to destroy large objects or utilize its surface area to knock off the balance of her opponents.