Many times early Badges/Pins were smaller as to cut cost.
As time evolved, Badges/Pins were standardized for size.
Many NIC have/had sweet heart Badges that were smaller.
Some just plain some with gems. There depending on the GLO were an assorment of gems that could be used and where on the Badge/Pin.
Check out GLO sites and see the different distinctions as it were.
Some stay plin, and some are Bling-Bling as some call them!