Could i buy this Iphone 4s cover?

I want to buy a new Iphone 4s Cover. But i don't know which one would be fit it well. My phone is a black one.could i buy this one? Http://www.gizga.com/luxury-rhinestone-crystals-bling-case-cover-protective-skin-iphone-4-4s-multicolor.html#.Umi4zrJwKzw Give your opinion and Why.

Ask the works at the store

It doesn't look good with black because of the green and diamonds. Even with the white the green makes it look bad.