Colorless (white) Sapphire (corundum) is a 9 on the Moh's scale, and a refractive index of 1.76 and Diamond is a 10 on the Moh's scale, and a refractive index of 2.41, the highest for colorless minerals.
(Colorless; is; a 9 on the Moh's scale) (a refractive index of 1.76 and Diamond; is; a 10 on the Moh's scale)
Colorless a refractive index of 1.76 and Diamond
is is
a 9 on the Moh's scale
a 10 on the Moh's scale