We are the Crystal Gems !
NOTE: This AU is NOT supposed to replace Ruby with Amethyst, Sapphire with Pearl or Opal with Garnet in the entirety of their characters. This means Opal, Ruby and Sapphire are their own gems prone to do things that we have never seen in canon. This, along with the fact that Homeworld gems are NOT swapped, means that the story could differ greatly from canon.