Clarity is a very important factor in diamond grading. Diamonds are graded on a clarity scale with FL (flawless) or "loupe clean" being the highest clarity. This means the diamond has the highest degree of purity or freedom from inclusions. Inclusions are formed in the crystallising or forming process of a diamond; they are usually naturally occurring. Some types of inclusions include carbon spots, other minerals, and other crystal inclusions such as garnet. Inclusions may look like fractures, clouds, feathers, stains, bubbles or tiny crystals.
Clarity Grading Chart
Below are the foremost clarity grading scales ranged together with impressions of clarities drawn in top view on diamond diagrams.