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F: Flawless: No internal or external flaws. Extremely Rare

IF: Internally Flawless: no internal flaws, but some surface flaws. Very rare.

VVS1-VVS2: Very Very Slightly Included (two grades). Minute inclusions very difficult to detect under 10x magnification by a trained gemologist.

VS1-VS2: Very Slightly Included (two grades). Minute inclusions seen only under 10x magnification.

SI1-SI2: Slightly Included (two grades). Minute inclusions more easily detected under 10x magnification.

D: D is the highest color grade and is an extremely rare diamond since it is considered colorless.

E: E has almost no color that can only be detected by a gemologist, and is a rare diamond.

F: F is still considered colorless with only a very slight hint of color, and is rated a high quality diamond.

G: G is a high quality diamond that is nearly colorless.

H: H is a high quality diamond that is nearly colorless.

I: I has only a slight hint of color and is rated a top value.

J: J has slightly more color and is rated a top value.

K-M: These diamonds may appear yellow or slightly brown depending on the cut grade.

Excellent: Excellent cut reflects most of the light and is an exceptional quality diamond.

Very Good: Very good cut reflects most of the light and is considered an excellent value.

Good: Good cut grade reflects a good amount of light, although less than a very good cut grade.

Fair: This diamond will produce a fair amount of brilliance, although less than a higher grade of cut.

Laboratory- A institution that provides professional unbiased opinions of diamond attributes including shape, dimensions, carat weight, clarity, color, and fluorescence. These characteristics reflect the value of the diamond.

Certificate- a written report prepared by a trained gemologist detailing the characteristics of a diamond. A certificate from a respected gemological laboratory provides important information and assurance about the quality of your diamond.

Laboratories- Many laboratories are displayed as three letter acronyms or abbreviations. These are the initial letters of the words of the phrase abbreviated, and are written in upper case capital letters.

GIA- Gemological Institute of America

AGS- American Gem Society

IGI- International Gemological Institute

HRD- Dutch abbreviation for Hoge Raad vor Diamant-Diamond High Council

EGL USA- European Gemological Laboratory located in the USA

Excellent: ranges from no polish features to a few minute polish features that can be viewed with difficulty face-up at 10X magnification.

Very Good: minor polish features are seen face-up at 10X magnification.

Good: : noticeable polish features are seen face-up at 10X magnification. The luster of the diamond may be affected when viewed with the unaided eye.

Fair: obvious heavy polish features are seen face-up at 10X magnification. The luster of the diamond is affected when viewed with the unaided eye.

Poor: prominent heavy polish features are seen face-up at 10X magnification. The luster of the diamond is significantly affected when viewed with the unaided eye.

Excellent: Rranges from no symmetry features to minute symmetry features that can be viewed with difficulty face-up at 10X magnification.

Very Good: Minor symmetry features are seen face-up at 10X magnification.

Good: Noticeable symmetry features are seen face-up at 10X magnification. The diamond’s overall appearance may be affected when viewed with the unaided eye.

Fair: Obvious symmetry features are seen face-up at 10X magnification. The diamond’s overall appearance is often affected when viewed with the unaided eye.

Poor: Prominent symmetry features are seen face-up at 10X magnification. The diamond’s overall appearance is significantly affected when viewed with the unaided eye.

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