I've been waiting for this.
New head canon, Sexual tension for Greg is a genetic thing, imbedded in all Pearls, no matter the color/Diamond

It isn't much but I got three examples.
I imagine all Pearls would have a fierce loyalty to they're masters or in our Pearls case, leader.
Quartzes, more specifically, Amethysts, all seem to be quite eccentric and free thinking.
And from what I can gather, Sapphire's seem to be pessimistic or stubborn. This can be seen we Saphirre accepts her supposed foretold demise just before she and ruby fuse and when she refused to get angry at Pearl during "Keystone Motel,"