Does the clarity grade have anything to do with how sparkly, clear, and transparent the diamond looks? The mall jewelers seemed to imply this to me, but I was under the previous impression that clarity grades only refer to the sizes/placements of the inclusions. For example, he said a VS grade stone will look noticably clearer and more sparkly than an SI stone b/c the inclusions in SI block the paths of light. Is this utter BS? Any info is appreciated. Also, is there any reason at all to get a VS2 grade stone if all I'm concerned about is not seeing any naked eye inclusions? I've heard conflicting info on whether or not you can actually see SI1 inclusions without a loupe. Any input?