It occurs to me that we didn't see Benitoite, Alexandrite, Padparadscha or Goshenite the younger- though some incident with Pad was mentioned rather ominously with reference to Yellow's condition. It's entirely possible that they're all doing fine on the moon, working on their own personal development, but i am not sure i trust this story that much. As such, i wonder how many of them have survived the last 220 years...