Rock has made a awesome hard shell for the Nokia Lumia 720. The main reason one should buy this is, that rubberised cases will cause a little friction while taking the phone out of the pocket and also while keeping it inside, and it will also gather dust and oilyness as the time passes. So this one which is water, sweat and dust proof, is surely the one to go for!
The following is a combo of the Naked Shells made for the Nokia Lumia 720 and the Nokia Lumia 520, by Rock.
And this is a low cost plastic cover which kills the beauty of the device
Karthikeyan 