Synthetic Rutile: Introduced in 1948. Has a high degree of brilliance. Faint yellow colour, doubling of back facets caused by high double refraction (Birefringence: 0.287). High Relative density 4.25; Refractive Index: 2.62-2.90; Scratches easily, Hardness:6.
This looks similar to a diamond of low colour grade. It has a high refractive index and a dispersion 6.5 times that of diamond which gives it an exceptional display of fire, and far too much to be diamond. Unlike diamond, Synthetic Rutile exhibits doubling of the back facets. Even with a bluish film added to the stone, some yellow body colour always remains.