Why diamonds refracts light a lot?

Answer 1

The speed of light is imperceptible in the reflection of light in diamonds. The light you see when looking at a diamond is caused by both reflection of light from the cut facets and refraction because of diamond's naturally high refractive index.

However, phosphorescence -- an afterglow -- occurs in some diamonds after being exposed to ultra-violet light, depending on the type of diamond and the trace mineral it contains. It is one way gemologists can verify that rare types of diamonds are nature made and not fake stones.

Answer 2

Yes, because of the reflective quality and the refractive quality of the materials used to fabricate and fashion the stone.

Answer 3

this is because the refractive index of diamond is made so that light is often hitting it at a critical angle so instead of being refracted thought the diamond it is reflected