Sphene is a rare collectors gem with high R.I. and excellent luster. Comes mostly a mix of Red and Green. A well cut sphene could display a multicolor effect with high brilliance
Sphene is a rare collector stone with an unusually high refractive index and and a hardness of 5 -5.5. Because of it's high dispersion and refractive index, a well cut sphene can display stunning brilliance. Sphene is somewhat soft and as a result is more suitable as a pendant than as a ring stone. Sphene is rarely very clean. 
