Recently I read a theory about Bismuth. The theory states that Bismuth is a mineral not a gem, which is actually true. It also says that since the Earth is different from Homeworld the Gems made there were different (ex Amethyst). All the Gems we know were created on Homeworld, except for a few that don't have confirmation. Then it says Bismuth was a weapon created by Rose to be used in the war, but when they (since Bismuth is a Mineral instead of a Gem we don't know if they have Feminine or Masculine features) were released on the battlefield, she was too violent and destructive, so in order to keep her side of the war safe, Rose bubbled Bismuth and put them into Lion's mane. I find this theory intresting so let me know what you guys think about it.