The highest clarity grade is F - Flawless, or IF - Internally Flawless.
For a 'colourless' or 'white' diamonds, the highest colour grade is D; for coloured diamonds, the highest colour grade is Fancy Vivid.
The lowest grade for diamond clarity is I3 in the GIA (Gemological Institute of America) clarity grading scale. Diamonds in the I3 category have very noticeable inclusions that may affect both the beauty and durability of the stone.
The standard magnification for diamond clarity grading under FTC guidelines is 10x. This level of magnification allows gemologists to accurately assess the internal characteristics of a diamond to determine its clarity grade.
AAA clarity is not a recognized rating for diamonds. The standard clarity scale for diamonds ranges from Flawless (no inclusions) to Included (visible inclusions). AAA is not a term used in the diamond industry to describe clarity.
Gem-stone diamond clarity is documented by a certified gemologist -- with an 'important diamond', potentially more than one gemologist -- according to a scale.From Wikipedia:"Diamond clarity is a quality of diamonds relating to the existence and visual appearance of internal characteristics of a diamond called inclusions, and surface defects called blemishes. ... Inclusions may be crystals of a foreign material or another diamond crystal, or structural imperfections such as tiny cracks that can appear whitish or cloudy. The number, size, color, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond. A clarity grade is assigned based on the overall appearance of the stone under ten times magnification."You can read more, below.
For a diamond, FL, or flawless, is the highest grade for clarity -- it is perfection for the stone in terms of its clarity.
D would be the highest grade
Clarity H-I sounds more like the colour grade. Clarity I2-i3 means that there are two or three visible inclusions in the diamond. This is the lowest clarity grade for gem-stone quality diamonds.
Diamonds are graded according to cut, colour, clarity and carat weight. When cutting a rough diamond stone, the diamond cutter first determines the natural colour of the stone, then plans a cut that preserves the highest carat weight for its maximum clarity. So the highest grade of diamond is the largest stone with zero flaws in the rarest colour with the most perfect cut for that stone. These diamonds are sold at auction and bring millions of dollars to sellers. In jewelry, the D colour is the highest grade colour; internally flawless is the highest clarity, blue and red could be the rarest natural colours. The Gemological Institute of America's Web site will help you better understand the four Cs, below. Finally, exceptional stones, are also graded according to the type of diamond, the most common being Type I. Read more about diamond types, below.
The I32 on a 14k diamond ring typically refers to the diamond's clarity grade, indicating it is an "I" grade with a clarity level of "32." In the context of diamond grading, "I" stands for "Included," meaning the diamond has noticeable inclusions that may be visible to the naked eye. This grade suggests that the diamond may have significant imperfections, which can affect its overall appearance. It's important to consider this clarity level when evaluating the quality of the ring.
Clarity for a diamond describes the number and amount of flaws or inclusions in a stone. Perfect clarity -- the lack of any flaws or inclusions -- is called Flawless, or Internally Flawless, which is the highest clarity grade.
For a 'colourless' or 'white' diamonds, the highest colour grade is D; for coloured diamonds, the highest colour grade is Fancy Vivid.
IMP1 Clarity refers to a diamond clarity grading scale used by some diamond sellers. It is typically considered to be an inclusion-heavy grade, indicating visible inclusions within the diamond that can affect its appearance and value. Diamonds with IMP1 Clarity may have noticeable flaws and imperfections when examined under magnification.
According to the Gemological Institute of America, from Wikipedia, below: "Included category (I) diamonds have obvious inclusions that are clearly visible to a trained grader under 10x magnification. Included diamonds have inclusions that are usually visible without magnification or have inclusions that threaten the durability of the stone." A gem rated with I-1 clarity indicates that a single inclusion is visible. This is the highest rating for the included category, which is the lowest rating for diamond clarity.
There are several 'best' grades, depending on whether you are grading clarity, cut or colour.Best clarity is Flawless or Internally Flawless (F) or (IF)Best 'colourless' grade is DBest colour grade for a naturally coloured diamond is Fancy VividBest cut depends on who's selling the diamond; many sellers claim that their cut is the 'best'.
The highest grade for 'white' diamond colour is D, not A. D is a higher grade than H in diamond colour.
The term "SI" indicates a clarity category, not a colour category. For clarity, "SI" indicates slightly included, and is usually followed by a number, 1, 2, or 3. In this scale, fewer is better.