It’s interesting too that Yellow Pearl and Blue Pearl aren’t caught unaware by the wave of Blue hitting them. Rather than express shock, they’re trying to maintain their composure as well.
They’ve likely seen this before and have experienced it as well.
Blue Pearl more than Yellow, which might be why she can hold it together a little better.
Even the Zircons below don’t express surprise the way Steven did when BD’s tears first started coming out of his eyes. At the same time, they’ve sobered up and we’re left without the taunting and face-making from earlier in the episode. This means they’ve either heard rumours of or witnessed this in the past.
What I do want to point out is the reverberating sound that comes when Blue cries. That unique ding is probably what induced the crying and Lars is unaffected by it.
That must mean that Blue’s powers, and similar gem abilities work with the use of sound waves that affect other gems via their gemstones or light bodies.