It's a piece of the Trifo- *slapped* Eh I mean...yes, it will be a gemstone >.> Maybe the Heart of Alegasia? I'm just going by the heart shape, but maybe it's he or she who wields it holds the life of Alegasia in their hands, and they alone have the ability to either bring the Kingdom to peace or absolutely destroy it.

Ooh ooh!! What if it actually [i]is[/i] the Princess' heart? O.O