[quote=Rusalka]
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 the Princess' heart? O.O
[/quote]

OMG I had the exact same name in mind, no lie no lie. So yeah, that will be the gems name. It will have been in the family since the beginning of time, and perhaps there are stories that speak about it, but people brush it off as like, a myth or something. Perhaps it's true name is unknown and it really has nothing to do with Alegasia, maybe the first king discovered it and has had it ever since, but like you said whoever wields it will bring peace and prosperity to their kingdom, or be able to destroy. 

It can be Crystal's heart, but wouldn't that make her invincible in a way? I was thinking her life force is stored in it, the gem needs a host or something and can only removed by a certain magical instrument, or a spell. idk. :o