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Artistry in Rock Crystal: The Van Pelt Collection

The lapidary arts of Harold and Erica Van Pelt.

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New Synthetic Rubies Made by Professor P. O. Knischka

A new synthetic ruby is discussed.

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A Report on the New Watermeyer Split-Facet Diamond Cuts

Introducing a new technique in diamond cutting that virtually eliminates the "bow-tie" effect.

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Modern Diamond Cutting and Polishing

Over the last 25 years, the diamond-cutting industry worldwide has been revolutionized by sophisticated instruments that provide invaluable aid in the process of creating a polished gem.

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

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

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Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Fire, and More about Brilliance

This second major article in a three-dimensional modeling study analyzes fire – the visible extent of light dispersed into spectral colors.

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Modeling the Appearance of the Round Brilliant Cut Diamond: An Analysis of Brilliance

A mathematical model which can analyze how appearance factors depend on proportions.

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

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

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GIA’S Symmetry Grading Boundaries for Round Brilliant Cut Diamonds

A presentation of parameters used to support GIA's symmetry grading system.

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Possible “Sister” Stones of the Hope Diamond

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.

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