Article Search Results

A Foundation for Grading the Overall Cut Quality of Round Brilliant Cut Diamonds

Thomas M. Moses, Mary L. Johnson, September 1, 2004

The GIA diamond cut grading system described here includes the components of brightness, fire, scintillation, polish and symmetry, as well as weight and durability concerns, into a single overall grade for cut quality for standard round brilliants.

Possible “Sister” Stones of the Hope Diamond

Scott D. Sucher, Stephen W. Attaway, Nancy L. Attaway, and Jeffrey E. Post, March 1, 2010

A recent study compares a specially created model of the Hope diamond with recent computer models of the French Blue to determine if other stones could have resulted from either recutting.

GemCad View of the French Blue Enclosed Within the Tavernier Blue

A Crystallographic Analysis of the Tavernier Blue Diamond

Scott D. Sucher, September 1, 2009

This study uses both historical information and modern data to create a computer model of the Tavernier Blue, orienting the finished diamond within the original diamond crystal.

De Beers near Colourless-to-Blue Experimental Gem-Quality Synthetic Diamonds

Marie-Line T. Rooney, C. M. Welbourn, March 1, 1993

De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognised without careful gemmological testing.

Faceting Large Gemstones

Michael Gray, March 1, 1988

The techniques for cutting and polishing gemstone giants.

Pleochroism in Faceted Gems: An Introduction

Richard W. Hughes, October 31, 2014

Describes the phenomenon of pleochroism and its complex effect on the appearance of coloured stones.

An Extraordinary Calcite Gemstone

C. S. Hurlbut, Jr. and Carl A. Francis, December 1, 1984

The unusual effects of dispersion and twinning produced by a calcite gemstone.

The Rise to Prominence of the Modern Diamond Cutting Industry in India

Menahem Sevdermish, Alan R. Miciak, March 1, 1998

this article reviews the rise of the modern diamond cutting industry in India and its impact on the world diamond trade

Curves and Optics in Nontraditional Gemstone Cutting

Arthur Lee Anderson, December 1, 1991

A series of cuts, designed by the author, exhibit extraordinary optical effects that result from a combination of curved surfaces and plane facets placed to take advantage of internal reflection.

Computer Rendering of the “French Blue” Diamond

The French Blue and the Hope: New Data from the Discovery of a Historical Lead Cast

François Farges, March 1, 2009

With the use of modern tools and technology, this article sheds light on the history and provenance of both the French Blue and the Hope diamonds.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition