The densely packed silica spheres are arranged in grid-like patterns, giving the gem a unique characteristic that is a “play of colors.” This phenomenon called opalescence refers to the stunning display of a shift of colors visible when light passes through it. Opal stone is found worldwide in countries like Australia, Mexico, Ethiopia, Brazil, and the United States. Opal stone is amorphous, meaning they contain water and are thus more susceptible to damage. Therefore, taking care of them from harsh chemicals, extreme temperatures, and direct sunlight is important.