GIA Diamond Grading Report
A Diamond Grading Report explains the specific characteristics of a diamond. These reports are issued by the Gemological Institute of America (GIA), which is among the most prestigious organizations in the diamond industry.
Diamond Characteristics Documented in the Diamond Grading Report
- Laser Inscription Registry - Each diamond with a GIA Diamond Dossier is laser inscribed with the report number.
- Shape and Cutting Style - The shape of a diamond and its cutting method.
- Measurement - Explains the diamond's dimensions in millimeters.
- Carat Weight - The weight of diamond listed to the nearest hundredth of a carat.
- Color Grade - A grading that evaluates the absence of color or whiteness in a diamond.
- Clarity Grade - Clarity grade determined fewer than 10 x magnifications.
- Cut Grade - A grade of cut examined by a diamond’s over the top appearance, design and manufacture. Cut grade available on round diamonds from Jan. 1, 2006 onwards.
- Finish - Grades that signify a diamond's surface placement.
- Polish - Determines the overall smoothness of the diamond's surface.
- Symmetry - Measuring the shape, arrangement and position of the diamond's facets in accordance to one another as well as the consistency of the design.
- Fluorescence - Color, and potency 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 diagram of the approximate size, type, and position of additions/flaws when examined under a microscope.
- Proportion Diagram - A sketch of the diamond’s actual proportions.
- Reading a Proportion Diagram - Proportion diagrams will normally include the following information:
- Depth: The height of a stone/gem when measured from the culet to the table.
- Table: Located at the top of the diamond, the table is the largest facet of a diamond.
- Girdle: Range of girdle thickness.
- Culet: Appearance, or lack thereof, of the culet facet.