Why does October have two birthstones?

October has two birthstones, opal and tourmaline, to offer a variety of choices that cater to different tastes and preferences. Opal is valued for its unique play of colors and is often associated with creativity and inspiration. Tourmaline, on the other hand, comes in a wide range of colors and symbolizes emotional well-being and healing. This duality allows individuals born in October to select a stone that resonates with them personally.