Thanks to FandomTrash13 for contributing!
Where was yellow and blue diamonds' gems? Their centers. Look at the picture above and you'll see that a yellow and blue diamond are next to each other in the center of the mural.
White Diamond's gem(look in previous chapter for picture) is on her forehead and the mural above has a white diamond on top.
There's a Pink Diamond at the bottom of the mural so that means that Pink Diamond's gem should be on her lower torso. Like Rose's.
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Steven Universe Theories (Continued)
RandomThis goes along with my previous theories! I hit the limit on the other book.