Promoting Avatars
It is possible to promote avatars once they reach rank 10. Promotion raises your avatar's prestige, refreshes the avatar conquest map and resets all features except clan tokens, veterans, armour set pieces (and associated retainers), Steam achievements and statistics. The colour of your avatar's ranking stars depends on his current prestige level. The default prestige level is bronze. You can promote your avatar to silver, gold, emerald, sapphire, ruby and finally diamond prestige levels.
Click here to view a video tutorial about this subject.