I've had dark circles for as long as I can remember and mine are dark enough at the inner half of my eyes that people have asked me a couple of times if I had been hit. I've managed to find exactly one concealer that covered them up AND didn't crease like crazy the second I put it on (naturally, it was discontinued). My undereye area is smooth when my eyes are open, but blinking makes creases.
I also have the added fun of having high cheekbones and being overweight, so I have extra fat pads right under my eyes, so they look more deep set than they actually are. I can be well rested and hydrated and you can still see a distinct line where my circles are.
Anyway, I say all that because I stopped wearing concealer on a regular basis years ago. Everything I tried just focused attention to something I was trying to conceal, so I decided acceptance was easier than fighting the battle. I bring my foundation up to my eyes, blend, and figure that dark circles are just part of my genetic heritage and move on.
I'm not saying anyone else should do that, but wanted to throw out a different perspective.
