Opal gemstones have a splendid and irregular play of color play. The opal gemstone - likewise the October birthstone - is known as different color types, and will regularly change with the lighting. In case you're searching for a gleaming, luminous bit of adornments, an opal rings, pendant, necklace, or bracelet is certain to amuse. As the birthstone of October, opal gems makes the ideal present for those observing October birthdays.