Is there a ranking page?

[pedro]

Is there anything that describes what my medal type and number means?

I don't know if a 25 diamond is any good.

As of right now there is no in-game leaderboard. It's likely to be added to the game for the next season (Season 1).
Anything related to what the number indicates on the rank and how high a rank is can be seen in the image below:



Let me know if you have any more questions.