The Scintillating Gem of Power is an essence gem which grants a moderate bonus to all three ability scores (Body, Mind, and Spirit). It is part of a series of gems with similar effects, being slightly stronger than the Brilliant Gem of Balance, but slightly weaker than both The Eye of the Demon and The Eye of the Dragon. Unlike some of the gems in the series, it does not have any alignment requirement.
In-game description: "When one is at peace, one can achieve a form of transcendence. The goal of every true master and every true scholar is to surpass the physical form and unite one with one's own spirit. In that moment of transcendence, all limits fall away, and a person can perform at levels never before thought possible."