Well, they do look rather pretty. But, diamonds are among the hardest material known to exist. Now, take a look at my cutie mark. You could say finding gems is a specialty of mine.

It takes talent and vision to see an imperfect gem and see the potential it has inside to become beautiful. Finding beauty is my special talent.

You see the spell weaponsizes your special talent. It's.. a rather personal and complicated piece of spell work. In a sense, the sword is an extension of my magic.