Classification

Classification

 

 The diamond industry relies upon grading laboratories and their standards to determine stone classifications. The Gemological Institute of America (GIA), as well as other diamond grading laboratories including the European Gemological Laboratory (EGL), the American Gemological Society (AGS), and the International Gemological Institute (IGI). All stones sold by IDC are accompanied by an IDC Certificate  complete with a photograph of the stone and, if relevant, its setting.

 

 Clarity

 

 Clarity Grading Scale

  

IF

VVS1...VVS2

VS1...VS2

SI1...SI2

I1...I2...I3

Internally Flawless

Very, Very Slightly Included 1 and 2

Very Slightly Included 1 and 2

Slightly Included 1 and 2

Included 1, 2 and 3

  

Clarity refers to the number, size, placement and the nature of inclusions and/or surface irregularities viewed in a diamond under 10x magnification. Higher magnifications, hi-tech equipment and viewing from other angles are used in gemological laboratories during the grading process.

 

 

Flawless:

 

No imperfections in the stone, or on the surface of the stone.

 

 

Internally Flawless (IF):

 

Has no inclusions when examined by an experienced grader using 10x magnification, but will have some minor blemishes.

 

 

Very, Very Slightly Included (VVS1 and VVS2):

 

- VVS1: Inclusions extremely difficult to see under ten-time magnification.

- VVS2: Inclusions very difficult to see under ten-time magnification.

 

 

Very Slightly Included (VS1 and VS2):

 

- VS1: Inclusions difficult to see under ten-time magnification.

- VS2: Inclusions somewhat easier to see under ten-time magnification.

 

 

Slightly Included (SI1, SI2, SI3):

 

- SI1: Inclusions easy to see under ten-time magnification.

- SI2: Inclusions very easy to see under ten-time magnification.

- SI3: This grade is used by the European Gemological Laboratory. It indicates the inclusions might be seen with the naked eye.

 

 

Imperfect (I1, I2 and I3):

 

- I1: The inclusions are easy to see with the naked eye, but they do not affect the durability of the stone.

- I2: the inclusions are easy to see with the naked eye, and they affect the durability of the stone.

- I3: the inclusions damage the stone so much that we may ask ourselves how it was even possible to cut and polish that stone without breaking it.

Some inclusions have interesting shapes while others do not. Like people, no two diamonds are exactly the same.

 

 

Contrary to popular belief, higher clarity does not always mean a more beautiful stone. If the inclusions are not visible to the naked eye, a higher clarity does not really improve the appearance of a diamond but it affects its rarity and price; hence, the higher the clarity, the more desirable and valuable the stone.

 

Color Grade

 

GIA Color Grading Scale

 

 

D..E..F

G..H..I..J

K..L..M

N..O..P..Q..R

S..T..U..V..W..X..Y..Z

Colorless

Near Colorless

Faint Yellow

Very Light Yellow

Light Yellow

 

 

 

Color refers to the absence of color in a diamond. The less yellow within the diamond, the higher on the alphabetical scale the diamond will be graded. Colorless diamonds are D-F, near colorless are G-J, faint yellow are K-M, very light yellow are N-R. S-Z are light yellow.

 

 

Fancy-Color Diamonds

 

It is surprising to learn that diamonds also occur in shades of pink, blue, green, amber, grey, brown, yellow, orange, lavender, red, black. These rarely occurring colors are referred to as Fancy-Color Diamonds, and they are evaluated by a different set of color standards. Among the rarest of nature's gems, they are the most expensive.

Of all colored diamonds mined, 80 to 90% are in the brown and yellow ranges.

Fancy-Color Diamonds

Fancy-Color Diamonds
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