The diadem or tiara is perceived as an emblem of the Queen of Heaven and the circle of continuity. It often has 12 jewels, which are said to represent the 12 Tribes of Israel. There is always a magical feeling or sense of wonder associated with the diadem or tiara, and it can be taken to represent the magical and unknown. In dreams as in real life it is felt to confer status. The diadem or tiara in a dream often acknowledges the power of the feminine, or the ability to use the mental or intellectual abilities to obtain supremacy. In a womans dream she is more likely to be wearing a tiara, this being a feminine image. In a mans dream he is more likely to wear a crown or coronet - a less elaborate form of crown. You might like to consult the entry for Crown.