A tiara is traditionally placed on a quinceañera during the symbolic crowning.
The crowning ceremony presents the celebrant with a tiara or crown as a visible sign of honor and maturity. In many families, a parent or another important relative places it on her head during the formal reception or presentation.
The tiara is usually part of the ceremonial sequence rather than a legal or religious requirement. Its style can range from a small jeweled headpiece to a more elaborate crown matching the dress and decorations.
A tiara is sometimes confused with a veil. A veil may be worn as part of the outfit, but the crowning specifically centers on a crown-like headpiece. Modern celebrations may alter, shorten, or omit this ritual.