NOTE: There are some fusions listed who may not end up appearing in the whole series of this AU.
Ruby + Sapphire: Garnet
Pearl + Amethyst: Opal
Ruby + Amethyst + Sapphire: Sugilite
Pearl + Ruby + Sapphire: Sardonyx
Pearl + Amethyst + Ruby + Sapphire: Alexandrite
Pearl + Ruby: Rhodonite (not the off-color)
Pearl + Sapphire: Sodalite
Amethyst + Ruby: Cacoxenite
Amethyst + Sapphire: Iolite
Ruby + Pearl + Amethyst: Cuprite
Sapphire + Pearl + Amethyst: Angelite
Steven + Connie: Stevonnie
Nora + Connie: Cora
Steven + Nora: Roseanne Quartz
Steven + Nora + Connie: Storma
Steven + Nora + Amethyst: Smoky Quartz
Steven + Nora + Pearl: Rainbow Quartz 2.0
Steven + Nora + Ruby + Sapphire: Sunstone
Steven + Nora + Ruby + Sapphire + Amethyst + Pearl: Obsidian
(Recently added)
Steven + Nora + Ruby: Sphalerite
Steven + Nora + Sapphire: Chalcedonyl

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Steven and Nora Universe
FanfictionA Steven Universe AU where Rose Quartz gave birth to twins, Steven and Nora, who each shares one half of their mother's gemstone. They live with the Crystal Gems: Ruby, Amethyst, Sapphire, and Pearl.