888-565-7641
Diamonds, Engagement Rings and Fine Jewelry
Understanding a GIA Diamond 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.

Features of the Diamond Grading Report Issued by the GIA
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: 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.

 
For More Information
Learn about our appraisals and other grading reports that accompany diamonds and fine jewelry from Blue Nile.

GIA Diamond Grading Report
GIA Diamond Dossier®
AGSL Diamond Quality Document
GCAL Diamond Certificate of Authenticity
Blue Nile Appraisal

Why Blue Nile?

Largest Online Retailer of Certified Diamonds
Forbes Favorite Online Jeweler Since 2000
Award-Winning Customer Service
888-565-7641
Why Blue Nile?

Discover Blue Nile

In the News
Read what's being said about Blue Nile in the news.
Customers Say It Best
Read how our customers feel about our performance.

Education & Guidance

Education & Guidance
Diamonds Platinum
Pearls Gold
Gemstones Silver

Contact Us
service@bluenile.com
888-565-7641
For phone orders,
please mention:
NCKY99
About Us
Blue Nile Advantage
Conflict-Free Policy
Careers
Investor Relations
Site Map
Services
Free FedEx® Shipping
30-Day Returns
Financing & Insurance
Refer a Friend
Sweepstakes
Blue Nile International
Blue Nile United States
Blue Nile Canada
Blue Nile United Kingdom
Newsletter and Offers
Receive special offers and
gift ideas from Blue Nile: