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Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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Duncan Pay
The Beauty and Value of Inclusions, Plus Double Stars and Corundum from Tajikistan

We invite gemologists to take a closer look at the astounding beauty and variety of the micro-world of gems.

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Article
Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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Whitish Graining with an Amorphous Appearance
The Impact of Internal Whitish And Reflective Graining on the Clarity Grading of D-To-Z Color Diamonds at the GIA Laboratory

This article reviews the GIA Laboratory’s history of reporting on certain types of graining which are often the only characteristics present in large, high-clarity, high-color diamonds.

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Illustration and spectrum showing absorption in yellow diamond
Visible Absorption Spectra of Colored Diamonds

Features a foldout chart containing representative visible spectra and photos of the major color categories of diamond.

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The Occurrence and Gemological Properties of Wessels Mine Sugilite

An examination of the two types of sugilite found at the Wessels mine in South Africa.

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Titanium-Bearing Synthetic Alexandrite and Chrysoberyl

Overview and commentary on the 2013 Journal of Gemmology article “Titanium-Bearing Synthetic Alexandrite and Chrysoberyl.”

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Some Unusual Sillimanite Cat's-Eyes

Inclusions cause chatoyancy in these rare gems.

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15 ct tanzanite
Pleochroism in Faceted Gems: An Introduction

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

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Grayish blue aquamarine
Aquamarine with Unusually Strong Dichroism

This aquamarine's most striking feature was its unusually strong dichroism, displaying very deep blue and pale bluish green colors.

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