Small knick on bezel of my phone iPhone 5

Ok, so I got my white iPhone 5 the day after it was released in Canada and it was working perfectly. I immediately got a case for it because I am very anal about keeping it perfect. Yesterday was the first time I dropped it. Fell out of my hand and onto the hardwood floor. Didn't think anything would happen because of the case. But I just took my case off to clean the screen and noticed there was a knick on the lower left hand side of the phone, right near the headphone jack. I was just wondering if I took this in to apple if they would replace it for me or fix it for me, and how much it would cost.

Also, the case I have is the Griffin "Reveal" case. So I obviously don't reccomend the case to anyone.

All help is appreciated, Thanks.