It's a hat for emerald and only works with gold (as of right now), maybe they'll add in purple or something else as well, but I was pointing out the Broken name effect hahaha.
Thats because the gold pawn for emerald is a hat, but I agree that they should introduce other gems as an addition to the pawn already, but Sapphire seems to be more appealing to users than emerald does, not to mention the vast amount of gems that there actually are (rather then allowing users to change their pawn color with hex).