4 C's of Diamond quality

         
  Carat  
weight of stone

100 points to carat

5 carats = 1gm

  Cut  
shape of stone

type of cut

proportion

polish

 
  Colour  
"whiteness" or lack of colour

graded alphabetically from D


D -
  Clarity  
presence of "flaws" in or on the Diamond

IF - no inclusions

VS - only visible under lens

SI - slightly included

I