Question

What is the reason behind the shining of diamonds and how do you appreciate it?

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

Explanation:

Diamond is the hardest substance in the nature. The shining of the diamonds is due to having high refractive index.

The amount of light reflected depends on the refractive index. Higher the refractive index of the substance, more will be the light reflected.

The cutting of the diamond is such that the a ray of light falling on the diamond is reflected multiple times inside the diamonds.

When a light falls on the diamond at angles greater than the critical angle then there will be total internal reflection.

Therefore, it sparkles more.