Bronze

This is the first tier Competitive Medal.
The price is 5.99$* and you will receive the "Competitive Bronze" Medal
This Medal comes with the bonus skin: F/S "Camo Storm"
Silver

This is the second tier Competitive Medal.
The price is 9.99$* and you will receive the "Competitive Silver" Medal
This Medal comes with the bonus skin: TEC-9 "Splinter Storm"
Gold

This is the third tier Competitive Medal.
The price is 14.99$* and you will receive the "Competitive Gold" Medal
This Medal comes with the bonus skin: AKR "Fabric Storm"
Platinum

This is the fourth tier Competitive Medal.
The price is 19.99$* and you will receive the "Competitive Platinum" Medal
This Medal comes with the bonus skin: M4 "Pixel Storm"
Brilliant
This is the fifth/highest tier Competitive Medal.

The price is 34.99$* and you will receive the "Competitive Brilliant" Medal
This Medal comes with the bonus skin: Butterfly "Fire Storm"
* all prices are from the american google play store
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This was the advertisement for the Competitive Medals on the ingame main menu.

You might also want to look at "Competitive Collection"