oh, never thought of that. If blue diamond is a fusion between white and yellow?

Ehhh…. Jaspers comments about fusion makes it unlikely but it is possible.

And with white stuck on earth, yellow would become the supreme overlord.

that is an interesting theory. But the whole mural fucks with the timeline. Because when was the mural created? Who made it?

Maybe the whole temple was made by white diamond after retreating into her gem after losing the battle of strawberry field.

If the “death” of white diamond marked the start of the first gem war for earth then the temple fusion between rose, pearl, amethyst, sapphire and ruby would mark the end when they finally drive back yellow diamond.