I'm pretty sure the pink diamond symbol on the "4-Diamond" emblem is Rose.

(Before anyone tells me Ian deconfirmed "Rose = Pink Diamond", I have never believed, and still don't believe, that theory.)

I just think the 3 coloured diamonds (Yellow, Blue, White) represent different "tribes"/"armies"/colonies"/idek led by the Diamonds whereas I theorise the "pink" diamond represents the Rebellion.

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