I don't know if this is the right place for this question but what does the color of the heart on the stem of the Dr. Grabow mean ? If anything ? I have Grabows with white, yellow and blue hearts on the stems and then some with no heart at all . The yellow seem to be a better pipe to me . Maybe just me but the blues are always lacquer heavy and the whites are a little better maybe a little different grain . The yellows are actually very pretty grain , seemed to have a little better stem and smoke a little better. Am I just imagining this or can someone shed some light for me ?