A royal crown is a type of headwear worn by royalty and other people of high status. The term can refer to three different types of headwear: a DIADEM, a TIARA, and a CORONET. A DIADEM is a type of crown that is made of metal and is often decorated with jewels. A TIARA is a type of crown that is usually made of metal and is often decorated with jewels. A CORONET is a type of crown that is usually made of gold or silver and is often decorated with jewels. All three types of royal crowns are symbols of power and authority.