A diadem is a type of ornamental crown or headband, often worn by royalty or nobility. Traditionally made of precious metals and adorned with jewels, diadems symbolize authority and power. They can be simple or highly elaborate, depending on the status of the wearer and the occasion. Diadems have been used in various cultures throughout history, including ancient Greece and Rome. In these societies, they were often associated with gods and goddesses, representing divine right and leadership. Today, diadems are still used in ceremonial contexts, such as coronations and royal events.