Sphene also known as titanate is remarkable for it's brilliance and extreme dispersion. In the early 2000s sphene was discovered in Madagascar. When looking for sphene I prefer those that are slightly yellowish green as opposed to those that are yellow with slight green. Brown secondary tones generally detract from the beauty of sphenes. All colors can be beautiful if the cut produces great brilliance in combination with high dispersion. Dispersion is the break up of white light into the colors of the rainbow. When you look at an outstanding sphene they are unlike any other gem with dramatic flashes of rainbow colors and because of the high refractive index sphene displays diamond like brilliance.