Natural zircon is a genuine precious stone with a crystalline structure dating back millions of years, while cubic zirconia is a synthetic material manufactured in laboratories. Zircon offers superior optical properties including higher dispersion (fire) and birefringence. Natural zircon typically has inclusions that authenticate its origin, unlike the flawless appearance of cubic zirconia. The price difference reflects this authenticity – natural zircon commands higher value due to its rarity and real geological origin.