Sphene, also known as titanite, is a striking and rare gemstone valued for its exceptional brilliance and fire, often exceeding that of diamonds. Composed primarily of calcium titanium silicate, sphene typically forms in metamorphic and igneous rocks and is found in colors ranging from green and yellow to brown and reddish hues. Its high dispersion and vibrant luster make it especially eye-catching, though its relative softness (Mohs hardness of 5–5.5) means it is best suited for jewelry worn with care. Sphene’s unique optical properties, including strong pleochroism—where the stone shows different colors when viewed from different angles—enhance its visual appeal and desirability among collectors and gem enthusiasts.