Bleu - Seared on the outside with a very red center
Rare - Seared on the outside with a bright red center that is warm but not hot
Medium rare - Seared on the outside, with a large band of pink in the center,reddish-pink center
Well done - Seared on the outside and nicely charred with a brown center through out and absolutely no pink whatsoever, while personal preferences vary we don't recommend this option