@AkayaofthemoonYeah. We also know how Rose found each of the crystal gems, or at least assume pretty strongly.
Garnet is probably the most concrete one, having a whole episode dedicated to her origins. We know that Ruby was a bodyguard who went out of line to protect the clairvoyant Sapphire, making the two fuse for the first time, and during their escape, they met rose.
Amethyst, though not concrete, we do know that she is from one of the kindergartens, and was the last of the gems to be found (With the exception of Lapis, whom we still know almost nothing about), most likely during the rebelion, or sometime right after.
And Pearl is where things get interesting. From what we've seen of other Pearls, their gem placement matches that of the gem/diamonds that they are assigned to, and even match their colors. given the placement of the gems on both the
Diamonds and their
Pearls, it's pretty safe to assume that our Pearl was actually White Diamond's pearl, who, with what we've seen of
White Diamond, does have her gem on her forehead, like pearl. It would also make sense for Garnet to call her a Renegade pearl if she left her previous owner for Rose.