MAC has awesome concealers..the studio tech works well to cover circles and yesh it shud be a lil yellow based..as i suffer frum this problem as well lol ive been covering them since i was 13!!!...however i recently have discovered bobbi brown concealer for undereyes..u buy the base separte if u need extra coverage..and it works rellli well.. a bit expensive but it lasts long and i perosnally luv it! u jus gota try and c wut works for u but highly recomend those two..the ppl there will help u and u can always return both those brands if u decided u dun liek em, good luck!

o and btw nvr use liquid concealer for dark circles..it will give u a gray luk and is not heavy enuf to cover!