She is the fusion of Ruby and Sapphire, and considered to be the current leader of the Crystal Gems. Garnet is one of the last surviving Gems on Earth who joined the Crystal Gems in the rebellion against Gem Homeworld, and afterwards assisted her friends in protecting the Earth over the next millennia. After Rose Quartz gave up her physical form to give birth to her son, Steven Universe, Garnet took over as the leader of the group.
Garnet is definitely the leader of the team. She is totally in control of everything everyone does.
Though she's often the most pragmatic and straightforward of theCrystal Gems, Garnet tends to act on intuition rather than seriously analyzing a situation, as often seen throughout the show. As de facto leader, Garnet is often the peacemaker of the Crystal Gems, especially when Pearl and Amethyst start arguing. She demands utmost respect from the Crystal Gems, and is not hesitant to berate team members if they refuse to follow an order.
Level-headed and cool, Garnet is capable of remaining composed in most situations. This is displayed in the episode, "The Return", wherein Amethyst and Pearl were at a loss for words when they tried to explain to Steven why he was forbidden from fighting alongside them at the Gem Warship's landing; Garnet was the only Crystal Gem who was able to effectively get their point across and convince Steven.
Sapphire
Sapphire has blue skin and pale blue, wavy hair with bangs that cover the top half of her face. She is slightly taller than Ruby. Her lips and facial structure resemble Garnet's. When her bangs are moved to the side, they reveal a large eye with a sky-colored iris and visible pupil in the center of her face. She lacks a nose and is the only Gem with that quality.
Ruby
Being a Gem of emotion, Ruby provides Garnet's strength and courage. In contrast, Sapphire embodies the cool nature and friendliness of Garnet. Ruby is often overly aggressive. She is known to have a short temper and violent ways of exhibiting her anger; this is best seen in "Keystone Motel", when she was infuriated to the point of using her thermokinesis and boiled the motel pool, even summoning her weapon at The Best Diner in the World. Ruby is also very willing to admit when she has taken her anger too far and will admit when she is in the wrong. She seems to put the welfare of Sapphire above all else, doing everything to find her, and immediately made sure that Sapphire was well. When Garnet is extremely disturbed, Ruby also appears to show the most visible reaction in comparison to Sapphire.