Obviously we all are riled up about the Diamond Authority and I may be late here and this theory may be a replica I don't know but here me out. Point to the ruins we've all examined at look at the three gems, possibly Blue, yellow, and white diamond. Yellow Diamond is in the sun, just like the metaphysical meaning of the gem would suggest(go to the yellow diamond page and there's a link to that.) Yellow Diamond is the most common of the three types, and the sun is the most influential celestial body in the solar system. I'm sure that Yellow Diamond in deed Does serve as the highest military official. I'm also sure that White Diamond is the one that deals with the more covert handlings. Blue Diamond would be the main voice of the authority.
All of this has been hypothesized, even the idea of Rose potentially being a diamond, but has anyone considered The Diamond Authority through the scope of one diamond? What if, all the Diamond's are one gem? What if this diamond can change form and does so to attribute to each situation? A leader needs to have different sides to them, and Jasper ONLY mentioned Yellow Diamond. What if Yellow Diamond is the base and most casual known of the Diamond Authority, but in order to control people or gem's she turns into white diamond, and in order to show her true power she becomes blue diamond. If you look at the mural of the three diamond gems, they all have the same mark of lines on their eyes. Why is only one of the Diamonds seen facing Rose? Jasper did say Rose was a strategist. Does it not make more strategic sense for all three diamonds to fight the greatest threat at once? I don't care how strong Rose is, she couldn't possibly take on three queen gems at once and I doubt any gems on Earth's side were as strong as Rose so I Don't think other gems were fighting the other diamonds while she took on Blue Diamond. I think there's one diamond with three different forms like Frieza and that almost is more terrifying than three separate ones. What do you think?