Rose Diamond Theory
I had this theory for a while but after seeing this post it does give it more ground. (I already replied to that post with this headcanon but I’ll make it a separate post too for the tag)
The gem Steven pulls from the lighthouse is very clearly a blue diamond right?
And this diamond seems to be the most hurt whenever Lars enters Ronaldo’s or “it’s domain” at the lighthouse, and it chooses this scene to portray its pain.
The breaking up of a friendship.
What if the blue diamond really belongs to THE Blue Diamond and this particular memory hurts her because of another incident where one of her closest comrades broke her trust and hurt her during a rebellion?
What if Blue Diamond and Rose Diamond were best friends?