Shape
   
 
Carat
 
Carat is the unit of weight for the diamond. A carat is further subdivided in 100 points ( 0.01 carat = l point ). One carat is equal to 0.20 grams. Value per carat increases with carat size, because larger rough diamonds occur less frequently. In other words, 2 half-carat diamonds taken together will not cost as much as 1 one-carat diamond, as the one-carat stone is more rare.
  
 
Colour
 
Symbol Meaning
  D E F
  G H I J
  K L M
  N O P Q R
  S T U V W X Y Z		   Colorless
  Near Colorless
  Faint Yellow
  Very Light Yellow
  Light Yellow
 
 
Clarity
 
Symbol Meaning Definition
  F   Flawless Free from all inclusions or blemishes.
  IF   Internally Flawless No inclusions visible at 10x magnification.
  WS1   Very Very Slightly Included #1 Inclusions that are extremely difficult to locate at 10x.
  WS2   Very Very Slightly Included #2 Inclusions that are very difficult to locate at 10x.
  VS1   Very Slightly Included #1 Minor inclusions that are difficult to locate at 10x.
  VS2   Very Slightly Included #2 Minor inclusions that are somewhat difficult to locate at 10x.
  SI1   Slightly Included #1 Noticeable inclusions that are easy to locate at 10x.
  SI2   Slightly Included #2 Noticeable inclusion that are very easy to locate at 10x.
  I1   Included #1 Obvious inclusions. Somewhat easy to locate with the unaided eye.
  I2   Included #2 Obvious inclusions. Easy to locate with the unaided eye.
  I3   Included #3 Obvious inclusions. Very easy to locate with the unaided eye.
 
 
Cut
 
Cut is the most diffcult to analyse or quantify amongst the 4Cs, generally, it refers to a diamond’s proportions, symmetry and polish.
The GIA cut scale are graded as Excellent, Very Good, Good, Fair or Poor.
  
 
 
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