Fusions aren't only the physical mix of two gems, but their personalities also come into play in their appearance.
Rainbow Quartz has two pairs of eyes and one pair of arms because Pearl and Rose see the situation two different ways, but they want to act the same way.
Opal has one pair of eyes and two pair of arms because Pearl and Amethyst see the situation in the same way, they just want to act differently.
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Steven Universe Oneshots
FanficHello and welcome to a book consisting of Steven Universe! The chapters range from headcanons, to short stories, and mostly angst. And ships. Have fun reading! (half of this is angst i lied, lapis is my son, garnet should be ruby x sapphire's ship...