IGI CUT GRADE EXPLAINED

IGI ROUND CUT GRADE

SUMMARY:

- IGI (International Gemological Institute) analyzes the cut grade of a round diamond by comparing its overall proportions, measurements and facet angles with IGI studies of brightness, fire, scintillation and pattern.

- The cut grade is assigned within a range of Ideal, Excellent, Very Good, Good, Fair and Poor.

- The five criteria that IGI primarily uses for grading a diamond's cut are: Total Depth, Girdle Thickness, Pavilion Depth, Crown Angle, and Table Width. These criteria affect how well a diamond reflects and disperses light.

This lab is most well known for providing retail replacement valuations along with overall quality grades of mounted jewelry for retailers such as Kays or Zales. In the past 5+ years, they have made tremendous strides to elevate their brand and assure accuracy in grading.

would prefer you to purchase a GIA or AGS certified diamond from sellers such as James Allen, Blue Nile, WhiteFlash or Brilliant Earth.

For instance this example from James Allen is GIA certified with "EXCELLENT PROPORTIONS".

SUMMARY:

The International Gemological Institute has developed its own methodology when it comes to analyzing Fancy Shape diamonds.

- POLISH - Analysis of the diamond surface

- SYMMETRY - Evaluation of the consistency and evenness of the outline and faceting

- LIGHT RETURN - Brilliance and sparkle evaluation of light refraction

This lab is most well known for providing retail replacement valuations along with overall quality grades of mounted jewelry for retailers such as Kays or Zales. In the past 5+ years, they have made tremendous strides to elevate their brand.

If you wish to read more about the IGI and their cut grade parameters, go to https://www.igi.org/grading-process/cut-grading/.

would recommend you purchase a GIA or AGS-graded diamond as, at the time of this writing, both the GIA and the AGS grades are consistently more strict in color. GIA and AGS-graded diamonds can be found from sellers such as James Allen, Blue Nile, WhiteFlash, or Brilliant Earth.

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*IGI is in the process of updating their information as of 3/8/23