Additional wealth, knowledge and a child. For a woman, a diadem is a non-Arab man. For men it is the loss of what is attributed to it, since gold is disliked [and dhahab, "gold," also means "going away"]. If a merchant sees that he put a diadem on his head, or it was taken from him, his wealth will go. If someone with authority puts it on, he will commit an error in his religion. If a king sees that his diadem or crown was taken off his head or seized, his kingship will end.
Dream meaning · al-Nabulsi
King's crown (diadem) إكليل الملك
Source: al-Nabulsi, Ta'tir al-Anam fi Ta'bir al-Manam, p. 20. English translation by iDreamBot. Quran verses: Quran.com, Saheeh International.