Dude amethyst is not an amethyst. Part of what happens when an amethyst is overly exposed to heat or radiation is that it becomes a citrine. Or it becomes a mixture called ametrine. They constantly have said that she is an over cooked amethyst. Before I thought it could of been her gem reflecting the landscape in earlier episodes, but now her gem is just yellow and purple all the time now. Amethyst is not a defect. She’s a different gem.
hear me out, pearl inspired other pearls on homeworld, some of them grouped up (with more differences in their appearance than color, i wanna see defective pearls!) and escaped on a ship, they were lead by 'black pearl' who has a very pirate theme, and have been trying to recruit more and more pearls to their cause, cgp meets bp realizes she has done more than she has as far as liberating gems, instead of becoming sad for herself tho, she instead uses bp as motivation to be better herself.