see below

Best info would be from the source: Diamond 4Cs Education - Introduction - GIA - 

Gemological Institute of America

Here's the description about clarity:

The GIA Diamond Clarity Scale has 6 categories, some of which are divided, for a total of 11 specific grades.

• Flawless (FL)
  No inclusions and no blemishes visible under 10x magnification
• Internally Flawless (IF)
  No inclusions visible under 10x magnification
• Very, Very Slightly Included (VVS₁ and VVS₂)
  Inclusions so slight they are difficult for a skilled grader to see under 10x magnification
• Very Slightly Included (VS₁ and VS₂)
  Inclusions are observed with effort under 10x magnification, but can be characterized as minor
• Slightly Included (SI₁ and SI₂)
  Inclusions are noticeable under 10x magnification
• Included (I₁, I₂, and I₃)
  Inclusions are obvious under 10x magnification which may affect transparency and brilliance

 

所有跟帖： 

• Link broken, try this: http://4cs.gia.edu/ -ECityBlues- ♀ (0 bytes) () 11/11/2013 postreply 10:28:42

• 回复：thanks a lot!! -lxpy- ♀ (0 bytes) () 11/11/2013 postreply 11:14:07