Clarity

Inclusions are natural identifying characteristics such as minerals or fractures, appearing while diamonds are formed in the earth. They may look like tiny crystals, clouds or feathers.  To view inclusions, jewelers use a magnifying glass, commonly called a "loupe". This tool allows jewelers to see a diamond at 10 times its actual size so that inclusions are easier to see.

The position of inclusions can affect the value of a diamond. There are very few flawless diamonds found in nature, thus these diamonds are much more valuable.  Inclusions are ranked on a scale of perfection, known as clarity, which was established by the Gemological Institute of America (GIA). The clarity scale, ranging from FL (Flawless) to Included (I), is based on the visibility of inclusions at a magnification of 10x.  The greater a diamond's clarity, the more brilliant, valuable and rare it is.

F - Flawless
Free from all inclusions blemishes at 10x magnification

IF - Internally Flawless
No visible imperfections under 10x magnification. Insignificant surface blemishes only.

VVS1-Very Very Slightly Imperfect.
Very difficult for a trained expert to see under 10x magnification.

VVS2-Very Very Slightly Imperfect 2.
Still quite difficult for a trained eye to see any imperfections under magnification.
VS1-Very Slightly Imperfect
Difficult to see imperfections under 10x magnification.

VS2-Very Slightly Imperfect 2
Starting to become easier to see under 10x magnification.
SI1- Slightly Imperfect 
A trained eye will have no difficulty under magnification, and an untrained-eye should be able to see some imperfections under 10x magnification.

SI2-Slightly Imperfect 2
An untrained eye will have no difficulty seeing some imperfections under 10x magnification.
I1-Imperfect 1
Will have imperfections just barely visible to the naked eye.

I2-Imperfect 2
Will have imperfections that are becoming easy to see with the naked eye.

I3-Imperfect 3
Will have imperfections that are easy to see with the naked eye.