When purchasing concealer, if you suffer from dark under-eye circles, purchase one that possesses a different pigment (or undertone) than your actual color and also color of the actual dark under-eye circles. For instance, if you have fair/light skin with rosey pigment (or undertone) and your circles are a blue, purchase a concealer that possesses warm pigments (or undertones) rather than using a lipstick.
"Orange" lipstick is often recommended under concealer as a base that meshes the actual color. Orange is a warm color and when you combine the colors together, it creates an illusion, as if the dark under-eye circles are invisible. You can use orange or even brown to create such an effect because they are both warm colors. The colors would have to be orange or brown, not mixed or collaborated with another shade. They would also have to be matte. This "orange" may not work on all skintones and pigments, especially those with warm pigments (or undertones). With women who possess warm pigments (or undertones) in their skin, including within their dark under-eye circles, "orange" would not work because it is a warm color. A woman with this issue would need a cool color such as "rosey red" or "fuschsia".
Most dark under-eye circles possess a purple or green kind of undertone, so yellow is possible to use, but only on cool pigmented (or undertoned) skin. You can actually use yellow, if it is brighter and a more visible color that can be build in place of the "orange".