Silk-Woven Nebula/Castes/Amber

Ambers are Gems created to do fetch quests. Only yellow and orange ones have existed and never, ever Blue ones. Nope, nada, not one.

Orange/Yellow Ambers, which are the only ambers to ever exist, yep
Small nobles, Ambers are enlisted to do fetch quests usually for diamonds, Lapis Lazulis, Sapphires, and Quartz Gems, but whomever performs a noble deed not of these castes worthy enough for an Amber to be requested unto them a fetch quest shall be rewarded.

BTW there are no blue ambers byyyyeeee.