“Heroes of Might and Magic V: Tribes of the East”

Hey everyone! I have a question! The names of the artifacts are written in different colors. I understand the composite ones, but what do the different colors of the regular artifacts mean? There are white, pink, blue, light yellow, light green, light purple, and others... Does anyone know? Please answer! Maybe this indicates their significance (like a simple artifact, a composite artifact, a relic... or just complete nonsense).