I got my mother's super dark circles under the eye area and I feel like I look like a drug addict when I don't have any concealer on b/c they really are THAT bad.  
So I have searched for years for an acceptable solution.  As of right now I use a bit of Revlon colorstay stay natural concealer, it's a wand type thing and I put a tiny bit under both eyes.  Then I let it sit for awhile before I blend it in, this way it has a chance to kind of dry out so when I do blend it, it doesn't just dissapear.
After that I use TheBalm concealer on top of the Revlon, it comes in a little pot kind of thing and it is the best thing on earth.  It covers everything, and it stays on forever!
Just make sure that if you do try something like this (layering concealers) that you put tiny amounts on at a time.  Blend it in and you can always add more if you need to.