Sphene, also known as titanite, is a brilliant and colorful gemstone prized for its exceptional dispersion, which can exceed that of diamond, producing a striking fire or rainbow-like sparkle. Typically found in hues of green, yellow, brown, and occasionally reddish or colorless, sphene’s rich tones and adamantine to subadamantine luster make it a unique choice for collectors and fine jewelry. Composed primarily of calcium titanium silicate, it often contains trace amounts of rare earth elements, which can enhance its color and brilliance. Due to its relative softness (Mohs hardness of 5 to 5.5), sphene requires careful handling, but its optical qualities make it a captivating and rare gemstone.