[Quality Granted] Unusual [Hero-specific] No [Explanation] These gems give the item an Unusual particle effect. They are only effective on Unusual couriers. Take care when hammering your unusual couriers. [Gem Type] 
Ethereal Gem
E t h e r e a l G e m
P r i s m a t i c G e m
K i n e t i c G e m
I n s c r i b e d G e m
S p e c t a t o r G e m
A s c e n d a n t G e m
A u t o g r a p h R u n e