I have finished all but some very minor quests (e.g. collect all shards) in the Hinterlands, which means I purged area from templars, mages, bandits and so on.
At the very same time, I'm upgrading my fortress. For a tapestry upgrade, I need 4 decorative gems. According to our almighty Google, it seems those are drops from all sort of scapegraces which I banished from the area.
In short, consider the situation - is there a way to farm or buy or in any other way get these 4 decorative gems?