Diamond
The 4'c of diamonds are :

The cut of a diamond refers to its proportions. It is one of the most important factors to be considered while choosing diamonds.

Clarity refers to how clear, or "clean" the diamond is.
Diamonds have imperfections which are present in its rough state.

Diamonds allow light to be reflected and dispersed as a rainbow of color. The color is graded from sparkling colorless white towards the yellow

A carat is a unit of weight used for gemstones including diamonds. One carat is equal to 200 milligrams. 1/100th of a carat is called a ‘point’.
