Ok. So. There’s a Possibility that our Pearl was not Rose Quartz’s Pearl. How do I know this? Well: 

This is White Diamond. She:

-has a forehead gem

-probably has a pale color palette (white diamond)

Sound familiar?

-light color pallet and forehead gem

Pearl and White Diamond have very similar designs. Just like Blue Diamond and her Pearl:

Their colors and gem placements are similar. 

In each Diamond’s respective court, and we see a lot of this in the answer, each gem has a similar color pallet. A lot of gems in Blue Diamond’s court (lapis, sapphire) are blue, and a lot of Yellow Diamond’s gems (peridot, jasper) are bright, neon colors and their colors are somewhat similar to yellow (peri’s hair, and jasper’s orange, which is yellow-y).

So, why then are Pearl and Rose’s colors so different? Because Pearl didn’t belong to her. Just look at this pic of them from the answer:

Their colors are so different. Rose is entirely pink, Pearl is almost entirely white. Keep in mind that this was on homeworld, and on homeworld all of the gems’ colors are of a limited pallet. Ruby was made of reds, sapph was blue, and when they fell to earth their colors returned to normal. Why is this important? White diamond. We know that gems generally have similar colors to their rulers.

Pearl is white. Not pink. White. There is a good possibility that she came from White Diamond’s court, and she was probably White Diamond’s Pearl.