Seeing a tiara or headpiece in your dream symbolizes leadership, travel, or marriage. If you find a tiara in your dream, it suggests that you may embark on a journey to a distant place. Wearing a tiara indicates the arrival of new opportunities in your life or the possibility of making important decisions. This dream points towards your future potential and new experiences on the horizon.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Tiara" (page 437) â resolved via the equivalent "Headgear" entry.
A headgear in a dream means a presidency, travels, or marriage. If one receives a headgear, or a tiara in a dream, it means that he may undertake a distant trip. If one wears a headgear in his dream, it means that he may hold a seat in the government. If one is accustomed to wearing a headgear then wearing it in a dream represents his superior, the governor, his brother, his father, his uncle, his teacher, or a scholar, for they all have equal right upon him. Wearing a dirty and a worn out headgear in a dream means sorrow, difficulties and distress. If one's headgear is stripped off his head, or if it falls to the ground in a dream, it means the death of his superior, or any of the abovementioned people. If a king offer someone a headgear or a tiara in a dream, it means that he will have the power to appoint people in different administrations. If a mishap befall one's headgear or the turban of an Imam in a dream, it will reflect upon his faith and the state of his congregation. Wearing a black turban in a dream means authority, or it could mean sitting in thejudges' bench. Wearing a headgear which is topped with a white feather in a dream means becoming a leader. Wearing a headgear that is made from animal fur or hide in a dream means becoming unjust and blinded to one's own injustice, or it could portray the wicked personality of one's superior at work. A headgear, a turban, or a tiara in a dream also could represent an ascetic. (Also see Overseas cap; Turban)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.