So, in your au, did gems originally take on mechanical looking forms, before changing into more organic looking ones(hence the mask)?
Good question!
But I won't answer things about "original gems" yet since it's spoilers :3c I do have things figured out for that first generation of gems though (first gemeration?)
As for the masks, they're a status symbol. Only higher-ranking gems may wear masks. However, commanding officers or rare gems like sapphires can only wear masks that partially cover the face. About 50% of their faces, maximum.
A gem's mask design reflects which diamond they serve. So markings similar to YD's mask serve YD and so on.
Among gems, mask = someone important.
Only Diamonds can wear masks that completely cover their faces, and unlike other gems that can wear masks seeing a Diamond's face without their permission is a huge transgression. To everyday gems, their masks are their faces.
Likewise, a Diamond can show great trust in another, low-ranking gem by willingly showing them her face. Although this would be pretty rare.
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