I just read up on Transfiguration so I bough the XL Edition of Carter's Display, filled it with 5 different cuts of gems (though only 4 different varieties of gems) and I figured I could try to transfigure them so that I can get the skull cut. And what did I get?! NOTHING! I can't transfigure! The only two options are "Add" which is blanked out since I have the display full, and "View" which only shows me the first gem I put up. I assume that there's supposed to be something else I can do with it. What am I doing wrong?