Question

why does diamond glitter

Answer 1

The sparkling isn't just the high refractive index - the shape matters too. Diamonds are cut so that a light ray falling on the diamond is reflected multiple times inside the diamond and therefore sends light out in all directions. Actually, diamonds don't shine, they reflect.

Answer 2

We all know that diamond sparkle and their shiny bright sparkles made us loved them more.

The reason why the diamond glitters is due to their higher reflective index which is 2.417.

The more the refractive number the more they glitter.

Not only that another reason for their brilliant glitters is due to their cuts.

The more the no of cuts and the finer they are the diamond glitters more.