Understanding a GIA Grading Report
|
|
A Diamond Grading Report documents the specific characteristics of a diamond. These reports are issued by the Gemological Institute of America (GIA),
which is among the most respected organizations in the diamond industry.
|
GIA Diamond Grading Report
|
|
The GIA set the standard for diamond grading and gemological identification, and their grading system serves as the international gem
and jewelry industry's benchmark credentials.
|
|
Diamond Characteristics Documented in the Diamond Grading Report
|
- Shape and Cutting Style: The diamond shape and cutting style.
- Measurement: Lists the diamond's dimensions in millimeters.
- Carat Weight: The weight of diamond listed to the nearest hundredth of a carat.
- Color Grade: A grading which assesses the absence of color in a diamond.
- Clarity Grade: Clarity grade determined under 10x magnification.
- Cut Grade: A grade of cut as determined by a diamond's face-up appearance, design and craftsmanship. A cut grade is available on round diamonds graded after Jan. 1, 2006.
- Finish: Grades that represent a diamond's surface and facet placement.
- Polish: Rating the overall smoothness of the diamond's surface.
- Symmetry: Measuring the shape, alignment and placement of the diamond's facets in relation to one another as well as the evenness of the outline.
- Fluorescence: Color, and strength of color when diamond is viewed under UV light.
- Comments: A description of additional diamond characteristics not already mentioned in the report.
- Clarity Plot: A map of the approximate size, type, and position of inclusions as viewed under a microscope.
- Proportion Diagram: A map of the diamond's actual proportions.
|
|
Reading a Proportion Diagram
|
Proportion diagrams will typically include the following information:
- Depth: Depth (for round diamonds) and/or width (for fancy shapes) relative to diameter.
- Table: Table facet (for round diamonds) and/or width (for fancy shapes) relative to diameter.
- Girdle: Range of girdle thickness.
- Culet: Appearance, or lack thereof, of the culet facet.
|
Referenced Material - Blue Nile (www.bluenile.com - Diamonds) |
|
About Us
