Gem (specifically Cross-Gem)
Lunar Sword (Medieval broadsword)
Four months (as of Time Gem)
Steven Universe (uncle figure)
Moonstone's physical form is a small girl as tall as Steven. She has voluminous, long light blue hair that passes her knees. Her skin is pale silver, almost white. She has turquoise eyes and her mouth is teal with a green blue tongue. Her moonstone gem is heart shaped and directly over her heart.
Though over time, Luna grows in size. As of "Heart of an Angel", she is a few inches taller than Steven.
Luna wears a simple mint green tunic that reaches her knees. Pearl eventually sews a pale blue star on the bottom of her dress. She is barefoot.
Like any newborn/child, Moonstone is curious and never means any harm. But like any Gem, she adapts easily to threats and doesn't hesitate to defend her family, despite being so young. She shows fast development in the span of three months, being able to already master a majority of her abilities.
Like normal Gems, Moonstone can shape-shift, summon a weapon, return to her gemstone to regenerate, and fuse with other Gems. Luna can activate her gemstone and summon her broadsword, which she and Steven call the Lunar Sword. According to the original Crystal Gems, no Gem had ever learned to do all that in such short amount of time. She can fuse with Steven to form Angel Quartz.
Being young, Luna doesn't know as much as the other Crystal Gems do. However, she is smart enough to know when something is bad and she needs to fight.
As a Cross-Gem, Moonstone has strength comparable to Garnet, a Fusion. She is strong enough to defeat corrupted Gems in a single attack by herself and hold her ground against Blue Diamond. Luna is also immune to mind control abilities, seeing as she easily resisted Blue Diamond's powers.
- Swordsman Skills: Despite being so young, Moonstone can efficiently wield a sword that's even taller than herself. In short amount of time, she was able to summon her weapon: a broadsword with a blue ribbon, dubbed the Lunar Sword by Steven. Her movements in combat are a bit choppy, but seem to reflect a little on Pearl's ballet and Jade's freestyle movements. She is swift and times her lunges with precision like her mom. Her born skills easily defeats Pearl's hologram in a few seconds.
- Light Energy Slash: Moonstone can charge her sword with light and then project it at a swarm of enemies with a slash.
- Copy: Luna has the unique power to copy another Gem's abilities and weapons for a certain period of time. She has shown to do this when she created a hologram from her gemstone like Pearl and made a screen in midair like Peridot. Some copied powers seem to be permanent, because she started "aging" thanks to Steven's power to decide his age.
- Healing: Luna has an amazing ability to heal Gems, similar to Steven and Rose Quartz. However, hers appear to be stronger since she is capable of healing corrupted Gems as well.
- She is the first Cross-Gem in the series.
- She is the first non-fused Gem overall with an alternate name.