The October Birthstone is the Opal.Opal stones exhibit a vibrant spectrum of colors, lending charm and beauty to any October birthstone jewelry they are fashioned in. These dual colored gems are prized across the world and are in high demand for their unique hue combinations and crystal structures.The internal structure of the opal causes the stone to diffract light thus exhibiting a range of colors. Depending on the conditions under which the stone is created, it can exhibit different colors. Opal hues range from clear and white to vibrant red, yellow, orange, blue, green, magenta, pink, rose, gray, slate, brown, black and olive. Red is the rarest while white and green opals are more common. Diamond essence offers beautiful October birthstone jewelry showcasing classic cut opals for all those in love with this gem. You can choose from solid gold to platinum plated silver and offer a beautiful gift to any October born loved one.