Each new Crown season, players get the opportunity to compete for a new Crown. You can find your previous crowns in your Player Profile.
 
 
Why does my crown look different on the Tournament leaderboard?

The leaderboard in the Tournament displays the crown that you earned for the current season. This allows you to compare your performance with other players based on their achievements in the current season.

Starting in the 3.0.0 update you can use (equip) any crown you have previously earned. 

The crown you are currently using will remain visible on your homepage, profile, team roster (if you’re on a team), and the Brilliance leaderboard.

This update helps highlight seasonal achievements while still allowing you to customize your profile. It also simplifies comparing your progress with other players in the current tournament.

Note: If you would like to use the most recent crown you have earned, you will need to equip it from your crown collection. Once you earn a higher-level crown, you will again need to equip that crown if you want to use it.