Garnet

Garnet is a fusion of Ruby and Sapphire, and is considered the current, unofficial leader of the Crystal Gems. Along with her team, Garnet is one of the last surviving Gems on Earth who rebelled against the Gem Homeworld to stop their invasion of the planet. After the war, Garnet helped protect the Earth over the next 5,000 years. After Rose Quartz gave birth to Steven Universe and lost her physical form, Garnet began to mentor Steven and help train him to use his powers.