Royal coronets, also known as tiaras, are ornamental headpieces worn by royalty and members of the nobility. They are typically made of precious metals and adorned with jewels and other decorations. The term 'royal coronet' is often used interchangeably with 'TIARA, ' though technically a TIARA is a type of coronet that is open at the top. Royal coronets have been used for centuries to signify rank and authority, and are still worn today by members of royal families around the world.