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Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

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Digital Photomicrography for Gemologists

A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.

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Opal from Querétaro, Mexico: Fluid Inclusion Study

The distinctive orange-to-red “fire" opals from Querétaro have not been found in significant quantities at any other locality.

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New Occurrence of Fire Opal from Bemia, Madagascar

Twenty-two gem opals from a new volcanic deposit located near Bemia

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Opal from Queretaro, Mexico: Occurrence and Inclusions

An examination of play-of-color opal from Mexico and its variety of inclusions.

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Abstracts; Winter 1991

This article, from the Winter 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Winter 2009

This article, from the Winter 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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