Ruby is a member of the Crystal Gems who made her official debut in "Jail Break". She was originally a Homeworld Gem soldier up until 5,752 years before the events of Steven Universe: The Movie. After accidentally fusing with Sapphire, the two fled in order to prevent Ruby from being shattered at the hands of Blue Diamond. Ruby later joined the Crystal Gems and became part of their new de facto leader Garnet, marrying her fusion partner in "Reunited".