Hardness 10
The oldest gem, who mostly does patrol duty. Yellow is portrayed as cheerful yet mature, but struggles with low self-esteem and feels responsible for all of their siblings.
SpoilerThey are one of the gems who accompanies Phos to the moon.SpoilerDuring their time on the moon, Yellow gradually becomes more and more mentally unstable, and eventually even begins to suffer from delusions, thinking of themselves as a Lunarian and becoming distressed whenever they realize they're really a gem.