GemShell is a single-piece case, notably lacking the flip-open bottom cover offered by Speck’s CandyShell Flip. The rubber comes into play at the corners, over the buttons, and around the screen, where it forms a protective lip, but is so well-integrated that the separate materials are almost indistinguishable, unless you look very closely. While it’s as tall and wide as CandyShell, it isn’t quite as deep, which is attributable to…