Those are the 3 (possibly 4) Lovely Charms farm spots left that won't take 1 gazzilion years. At least that I am aware of.
I'll save you 145 seconds of your life. The 3 spots are:
Throne of the Tides (heroic)
Crypt of Forgotten Kings (scenario)
The best is the Crypt giving around 400 charms in 10 minutes.