Phone: 989.631.9080
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Diamond Certification

If you are selling your diamond to AB&L, letting us broker it , or placing it on Consignment with us, then having a diamond certification and/or an appraisal will give you an edge in getting more cash for your item.


What is a Certificate?

A diamond certificate, also called a diamond grading report, is a report created by a team of gemologists. The diamond is evaluated, measured, and scrutinized using trained eyes, a jeweler’s loupe, a microscope, and other industry tools. A completed certificate includes an analysis of the diamond’s dimensions, clarity, color, polish, symmetry, and other characteristics. Many round diamonds will also include a cut grade on the report.

Diamonds graded by either the Gemological Institute of America (GIA) or the American Gem Society Laboratories (AGSL) are among the most respected in the diamond industry, and are known for their consistency and unbiased diamond grading systems. Diamonds that are accompanied by these grading reports are the most highly valued in the industry.

If you are interested in obtaining a Certification or Appraisal, please contact AB&L.

Diamond Characteristics Documented in a Diamond Grading Report are:

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: The height of a gemstone 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.