The Gemological Institute of America (GIA) Diamond Grading Report



Understanding the GIA Diamond Grading Report

National Gemstone markets diamonds with GIA Grading Reports. The GIA was formed in 1931 and is a non-profit institution. They do not buy/sell or appraise diamonds. They are an educational and research institute. Please note, a diamond graded by a person who graduated from the GIA is not the same as a GIA Grading Report. Do not buy a diamond from anyone who grades and sells it. There is too much temptation to over-grade the diamond. The GIA operates like a neutral intermediary between the buyers and sellers.

Shape and Cut
Each diamond is described as to its shape (round, oval, pear, etc.) and its cut (brilliant, etc.)

Weight
Diamonds are weighed on an extremely accurate digital balance. One carat equals 100 points, which weigh 1/5 gram.

Proportions
The items in this category relate to the cut (or make) of the diamond:

Clarity
GIA Clarity Grading Scale

IFVVS1...VVS2VS1...VS2SI1...SI2I1...I2...I3
INTERNALLY FLAWLESSVERY,VERY SLIGHTLY INCLUDED 1 AND 2VERY SLIGHTLY INCLUDED 1 AND 2SLIGHTLY INCLUDED 1 AND 2INCLUDED 1, 2 AND 3

Clarity refers to the summation of the number, size and placement as well as the nature of inclusions and/or surface irregularities. Flawless stones are diamonds free of inclusions under 10 power. Internally flawless are diamonds without any internal inclusions. VVS1 and VVS2 have extremely small inclusions. VS1 and VS2 possess small inclusions. SI1 and SI2 have inclusions that can be seen easily under 10 power magnification, but are not usually visible to the naked eye. I1, I2, and I3 have large inclusions that are visible to the naked eye.

Color Grade
GIA Color Grading Scale

D..E..FG..H..I..JK..L..MN..O..P..Q..RS..T..U..V..W..X..Y..Z
COLORLESSNEAR COLORLESSFAINT YELLOWVERY LIGHT YELLOWLIGHT 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.

Fluorescence
Fluorescence describes the degree of sensitivity of a diamond to long wave ultraviolet radiation.

No Appraisals or Valuations
The GIA objectively grades only, it does not place a valuation on the stone in its grading report.

For more information, visit GIA's internet site.


Ideal Parameters