Nothing gives away tiredness like dark circles under your eyes, but concealer alone won't get the job done. Color-correcting dark tones around your eyes is the only way to truly eliminate the problem. Try a peach-toned one, such as Bobbi Brown's Corrector in Bisque ($27) or Pixi's Correction Concentrate in Brightening Peach ($12), which are most effective in canceling out blue or purple tones. Apply the corrector gently using your fingers or a concealer brush in a half-moon underneath your eyes where you find discoloration. A little bit goes a long way, so make sure not to cake it on. Follow up with your usual concealer and make an inverted triangle under each eye. By placing your concealer in this fashion, you brighten the entire area and draw attention away from the circles. Blend out the concealer with a damp Beautyblender ($20), and set with your favorite under-eye powder. Watch the darkness disappear and your eyes look instantly lifted.
