It's form is its purpose. The gem's behavior is its true function. Inability to grasp that concept is the paradox that questions the gem's function based on the consequences of its behavior.
The Gem has a random chance to say "Perfect Gem Activated." I heard some kid got it to say that and his house exploded.
Think about it.
<LamerX> HOW 2 UZE GEM?
<Storm_Shot> The Gem does nothing.
it HAS to do something.... doesnt it....