I wanted to show you guys how I imagine each Pearl related to their real-world Gem equivalents. I've recently been down a rabbit hole of studying different types of Pearls, so here is how I imagine them anyway!

Pearl - Our Pearl would be a white Akoya pearl with a Rose overtone. This is the classical "pearl" you'd think of.

Yellow Pearl - Yellow Pearl would be a lemon yellow Akoya pearl!

Blue Pearl - Blue Pearl would be a famous, rare Hanadama blue Akoya. These pearls have an icy silver-blue veneer.

Pink Pearl - Pink Pearl would be one of the brilliant pink Edison pearls! These are freshwater unlike Akoyas.

Morganite's Pearl - The Pearl making up Rhodonite. I think she would be a peach Edison, nice and salmony pink just like a Morganite.

Aubergine Pearl - She's actually the most niche color I've found. Aubergine Tahitian pearls are plum-black. I think they're some of the coolest.

Lonely Pearl - I think she would be a basic cream Akoya pearl.

Mega Pearl - Technically a fusion but her color palette matches the very rare Conch pearls! These pearls are non-nacreous, and instead resemble dappled pink and orange porcelain.

I will imagine the more mysterious Pearls from the Reef another time if you guys would like!

Images pulled from Google and the Steven Universe wiki.

How I imagine the Pearls and their real-life equivalents.