DiamondonNet Dictionary
DiamondonNet dictionary of common loose diamonds and diamond jewelry terms in the industry and their meanings.
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Clarity
Diamonds with few flaws, or inclusions, are very rare and highly valued. Inclusions are natural identifying characteristics such as minerals or fractures, appearing while formed in the earth. They may look like tiny crystals, clouds or feathers. Below are the definitions of Clarity grading.


Clarity Grade Diagram



Clarity Grade
Description
FL
Flawless.
Shows no inclusions or blemishes of any sort under 10X magnification when observed by an experienced grader. No internal flaws. Very rare and very expensive.
IF
Internally Flawless.
Has no internal inclusions when examined by an experienced grader using 10X magnification, but will have some minor blemishes. Also very rare and very expensive.
VVS1
Very, Very Slightly Included.
This contains minute inclusions that are difficult to see under 10X magnification even for experienced graders.
VVS2
Very, Very Slightly Included.
Contains minute inclusions that are difficult even for experienced graders to under 10X magnification. More inclusions compared to VVS1.
VS1
Slightly Included.
Contains inclusions (clouds, included crystals, knots, cavities and feathers) that are noticeable to an experienced grader under 10X magnification. Might be visible to the naked eye. Lesser inclusions as compared to VS2 and this grade is considered of good quality.
VS2
Very Slightly Included.
Contains minute inclusions such as small crystals, clouds or feathers when observed with effort under 10X magnification. More inclusions as compared to VS1 but less compared to SI1. Inclusions are not visible to the unaided eye and is considered high quality.
SI1
Slightly Included.
Contains inclusions (clouds, included crystals, knots, cavities and feathers) that are noticeable to an experienced grader under 10X magnification. Might be visible to the naked eye. Lesser inclusions as compared to SI2 and this grade is considered of good quality.
SI2
Slightly Included.
Contains inclusions (clouds, included crystals, knots, cavities and feathers) that are noticeable to an experienced grader under 10X magnification and might be visible to the naked eye. Lesser inclusions as compared to SI3. A good diamond value.
SI3
Slightly Included.
Contains inclusions (clouds, included crystals, knots, cavities and feathers) that are noticeable to an experienced grader under 10X magnification. Might be visible to the naked eye. Lesser inclusions as compared to I1. A good diamond value.
I1
Contains inclusions (possible large feathers or large included crystals) that are obvious under 10X magnification and may affect transparency and brilliance. Inclusions are visible to the naked eye.
I2
Large and/or numerous internal defects which are very easily discernible by the experienced expert with the naked eye and which diminished brilliance.
I3
Large and/or numerous internal defects which are easily discernible by the experienced expert with the naked eye and which slightly diminished brilliance.