Sphene, also known as titanite, is a fascinating gemstone known for its unique optical properties. It typically exhibits a vibrant yellow-green to brownish color, but can also be found in shades of orange and even colorless. One of its most distinctive features is its strong double refraction, which can create a mesmerizing play of colors and brilliance, making it highly sought after by collectors.

In terms of metaphysical properties, sphene is believed to promote communication, emotional balance, and personal growth. It's often associated with enhancing one's self-confidence and wisdom, making it a powerful stone for those seeking to develop their inner strength and clarity.