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To gain a deeper understanding of the GIA Diamond Cut Grading System, we invite you to explore the many articles GIA has published to chronicle the research and development of the system. Gems & Gemology
Research & Implementation Articles
Loupe Articles
Press Releases and GIA Insider



Gems & Gemology

Landmark articles on GIA's diamond cut research have been published in GIA's award-winning quarterly journal, Gems & Gemology, and are available for download:

(PDF) GIA's Symmetry Grading Boundaries for Round Brilliant Cut Diamonds (Winter 2011)

(PDF) A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds (Fall 2004)

(PDF) Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More About Brilliance (Fall 2001)

(PDF) Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Brilliance (Fall 1998)




Research & Implementation Articles

The following articles explain the foundational science behind GIA's research on diamond cut, and cover other essential topics related to the GIA Diamond Cut Grading System.

New Releases (back to top)

(PDF) Weighing In: Weight Ratio Within the GIA Diamond Cut Grading System (Originally published in Rapaport Diamond Report: February 1, 2010)

(PDF) From the GIA Laboratory: Visually Estimating Painting and Digging Out in Standard Round Brilliant Diamonds (April 2006)

(PDF) Culet and Girdle Assessment: Assessing culet and girdle in standard round brilliant diamonds at the GIA Laboratory (Originally published in Rapaport Diamond Report; January 2006)

(PDF) Polish and Symmetry: Craftsmanship in the GIA Diamond Cut Grading System: Evaluating Finish in Standard Round Brilliant Diamonds (Originally published in Rapaport Diamond Report; October 2005).

(PDF) Proportion Measurement Tolerances for the GIA Diamond Cut Grading System (Originally published in Rapaport Diamond Report; Aug. 2005).

(PDF) Painting and Digging Out: Variations on Standard Brillianteering of Round Brilliant Diamonds (Originally published in Rapaport Diamond Report; June 3 2005).

(PDF) Measurement Tolerances: Accuracy and Precision in the Gem Industry (Originally published in Rapaport Diamond Report; Apr. 1, 2005).

Archived Articles (back to top)

Technical Diamond Cut FAQ (Mar. 21, 2005)

Computer Modeling Part 2: A Closer Look at Metrics (Feb. 25, 2003)

How Science Works: Understanding the Scientific Method (Sept. 27, 2002)

How Science Works: Understanding the Scientific Method (Summary) (Sept. 27, 2002)

The GIA Diamond Proportion Module: Illustrating How Changes in Individual Proportions Affect the Appearance of a Round Brilliant Cut Diamond (Aug. 30, 2002)

Diamond Appearance: The Components of a Computer Model (Nov. 30, 2001)

The Visual Presentation of Information: Part 2 (Nov. 16, 2001)

The Visual Presentation of Information: Part 1 (Oct. 26, 2001)

The Optics of a Dirty Diamond (Sept. 28, 2001)

What did Marcel Tolkowsky Really Say? (Sept. 14, 2001)

The Importance of Three-Dimensionality (Aug. 17, 2001)

Diamond Optics Part 3: The Effects of Polarization States on Light Behavior (Aug. 3, 2001)

Diamond Optics Part 2: Light Dispersion, Color Wavelengths and Fire (July 20, 2001)

Diamond Optics Part 1: Reflection, Refraction and Critical Angle (July 6, 2001)

GIA and Its History with Cut (June 22, 2001)

Cut — The Least Understood "C" (June 8, 2001)



 

Loupe Articles

(PDF) Winter '06 How to Explain Cut at the Counter: The new cut grading system is a comprehensive and powerful tool for retailers

(PDF) Winter '05 Cut Uncovered: GIA’s new round brilliant cut grading system sheds light on diamond’s overall appearance

(PDF) Fall '05 New Cut Grade Ready for Issue Starting Jan. 1, 2006

(PDF) Spring '05 Researchers Update AGA Members on Proposed Diamond Cut Grading System

(PDF) Fall '04 Fall G&G Outlines Diamond Cut Grading System

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Press Releases and GIA Insider

GIA has published several press releases and shorter, less technical articles regarding diamond cut in its bi-monthly e-newsletter, GIA Insider Subscribe Now!

Press Releases (back to top)

GIA Offers Free Diamond Cut Grading Seminars (March 10, 2006)

GIA Laboratory Implements New Services Related to Diamond Cut Grading System (December 22, 2005)

GIA to Shed Light on Diamond Cut Grading System in Upcoming Presentations (November 3, 2005)

GIA Laboratory to Focus on Institute's New Diamond Cut Grading System at GemFest Asia (August 4, 2005)

GIA Announces Implementation Plan for Diamond Cut Grading System (August 1, 2005)

Core of GIA's Diamond Cut Research Revealed in Tucson Seminar (Feb. 18, 2005)

Fall Issue of Gems & Gemology Features Landmark Study on Diamond Cut (Oct. 8, 2004)

GemFest Basel to Provide Update on GIA's Diamond Cut Research (March 11, 2004)

GIA on Diamond Cut Series Now Available in Print-Friendly Format (July 8, 2003)

GIA Diamond Cut Research Team Seeks Volunteers for Observation Testing in Tucson (Jan. 21, 2003)

GIA Research Conducts Largest-Ever Series of Observation Tests on Diamond Appearance (Dec. 6, 2002)

GIA Cut Researchers Produce Study on Fire; Results Published in Fall 2001 G&G (Nov. 5, 2001)

GIA Insider (back to top)

Insider Gemologist: What Are Brightness, Fire, and Scintillation, and How Do They Factor Into Estimating a Standard Round Brilliant Diamond's Cut Grade? (May 12, 2006)

Insider Gemologist: How Does GIA Education Teach Diamond Cut Grade Estimation? (April 28, 2006)

Free GIA Diamond Cut Grading Seminars (March 10, 2006)

Learn More About the GIA Diamond Cut Grading System (February 24, 2006)

GIA Provides Easy Online Access to Estimating Cut Grades Through Facetware Look-Up Tables (February 10, 2006)

GIA Laboratory Implements New Services Related to Diamond Cut Grading System (December 21, 2005

GIA Education Incorporates Diamond Cut Grading System in 2006 Curricula (December 21, 2005)

Institute to Shed Light on Diamond Cut Grading System in Upcoming Presentations (November 4, 2005)

Presentations on GIA Diamond Cut Grading System Scheduled Worldwide (August 26, 2005)

Thoughts from the President: No Cut Before Its Time (August 10, 2005)

GIA Laboratory to Focus on Institute's New Diamond Cut Grading System at GemFest Asia (August 12, 2005)

GIA Announces Implementation Plan for Diamond Cut Grading System (August 2, 2005)

Institute Experts Give More Details on Upcoming GIA Diamond Cut Grading System (July 15, 2005)

From Gems & Gemology: Free Download of Diamond Cut Series Now Available (July 1, 2005)

Thoughts From the President: The Differences in Appearance Within GIA Diamond Cut Grades (April 15, 2005)

GIA On Diamond Cut – Some Frequently Asked Questions (FAQs) About the Cut Grading Foundation Article (March 25, 2005)

Thoughts from the President: The Differences in Appearance Within GIA Diamond Cut Grades (March 15, 2005)

Cut Grade Details Revealed at GemFest Asia (Oct. 29, 2004)

GIA Gives Industry Leaders Update on Institute, New Cut Grading System at IEC Meeting (Aug. 13, 2004)

Industry Analysis: Big Diamonds, High-End Strong at Basel (April 30, 2004)

From Gems & Gemology: Every Facet Really Does Matter to the Appearance of a Round Brilliant Cut Diamond — Revisited (Feb. 13, 2004)

GIA on Diamond Cut: Computer Modeling Part 2: A Closer Look at Metrics (Feb. 28, 2003)

The GIA Diamond Proportion Module: Illustrating How Changes in Individual Proportions Affect the Appearance of a Round Brilliant Cut Diamond (Aug. 30, 2002)

Spring Loupe Offers Exciting Discoveries (May 3, 2002)

From Gems & Gemology: Highlights of the Tucson Diamond Symposium (March 1, 2002)

Some Spaces Still Open for GIA Brilliance Study in Tucson (Feb. 1, 2002)

Diamond Appearance: The Components of a Computer Model (Nov. 30, 2001)

GIA and Its History with Cut (June 22, 2001)

Welcome to GIA's New Series on Diamond Cut (June 8, 2001)