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diamond clarity.
The clarity scale (GIA)

Diamond Clarity

     Clarity measures the relative visibility of external blemishes or internal imperfections (inclusions) naturally occurring within a diamond as evaluated by a qualified gemologist. The clarity scale (GIA) is divided into six primary categories:
   

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Not
visible 10x
(F or FL) Flawless
No discernible surface blemishes or inclusions visible when viewed at 10x magnification.

(IF) Nearly Flawless
Insignificant surface blemishes and no internal defects visible at 10x magnification.

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Very
difficult 10x
(VVS-1 & VVS-2) Very, Very Slight Inclusions
Extremely difficult to very difficult to find surface blemishes or minute inclusions at 10x magnification, but can be more readily seen at 10x once located at 20x magnification.

Difficult
to find 10x
(VS-1 & VS-2) Very Slight Inclusions
Difficult to somewhat easy to find surface blemishes or minor inclusions at 10x magnification.

Somewhat easy
to find 10x
(SI-1 & SI-2) Slight Inclusions
Easy to very easy to find surface blemishes or readily noticeable inclusions at 10x magnification, but will usually appear to be "eye clean" without magnification, though some stones will show slight inclusions when viewed from the side against a white background (note: GIA does not recognize an SI-3 clarity grade).

Difficult to find
unaided eye
(I-1) Imperfect
Surface blemishes or obvious inclusions are somewhat difficult to find with the naked eye, but are easy to see especially after being located with 10x.

Easy to find
unaided eye
(I-2, I-3) Imperfect
Surface blemishes or obvious inclusions are somewhat easy, or very easy to find with the naked eye. I-2 inclusions will have an effect on either the diamond's aesthetic appearance (beauty) or durability (potential for cracking), I-3 inclusions will have an effect on both. 
 
         
 
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Diamonds clarity. The clarity scale (GIA). Buy loose diamonds, diamond rings and more at BuyDiamonds-USA.com