Okay kiddo, have you ever watched a king or queen being crowned on TV or in a book? Well, the crown they wear is called a coronation crown. It's a really special kind of crown that's only used for when someone is becoming a new king or queen.
This crown is very fancy and expensive. It's made out of shiny metals like gold and silver and is covered in precious jewels like diamonds and rubies. It's almost like a big, sparkly hat that sits on top of the head of the king or queen.
When someone becomes a new king or queen, they usually have a big ceremony called a coronation. During this ceremony, they put on the coronation crown and everyone cheers for them. It's a very important day for that person and for the country they are going to rule.
People have been using coronation crowns for a very long time, and they are usually kept safe in a big, fancy museum when they're not being used. It's a really cool and special thing to see!