That's the thing though, I doubt Peridots & Pearls would go in the same grouping to account for the Gemgineering. Water Walking & Advanced Hammer Space are both possessed by Pearl & Lion, with strong hints that Lion's powers are part of the same group as Rose. Sapphire & Rose Quartz both have hovering abilities, and is likely part of the super jumping tree that all of the primary Crystal Gems have. The overlaps among the gems we have are still permitting a single 'class' that is anything but cohesive. You can make multiple distinct classes out of just the power set that Steven/Rose have.
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Put a greatsword a maul and a greataxe in a room and ask them to take their pick
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