As one of the strongest substances on the planet, diamonds themselves represent eternity. Diamonds can mean undying love and devotion, loyalty, fidelity, eternal friendship, unwavering partnership and commitment - they can also represent the future, promising a life of togetherness and closeness. Diamonds on eternity rings represent all of these meanings in an eternal circle, essentially magnifying their meanings, continually emcompassing the finger in a never-ending circle of lasting beauty.