Sphene—also known as titanite—is a calcium titanium silicate gemstone prized for its exceptional brilliance and fiery dispersion, which can exceed that of diamond. Typically found in hues of green, yellow, brown, or orange, it often exhibits strong pleochroism, showing different colors when viewed from different angles. Its remarkable sparkle arises from its high refractive index and dispersion, giving well-cut stones vivid flashes of red, green, and gold. Although relatively soft compared to other gems, sphene remains highly sought after by collectors for its unique optical properties, rarity, and richly saturated colors.