Optical Effects of Phenomenal Cabochons
Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.
Digital Photomicrography for Gemologists
A guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software.
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.
New Occurrence of Fire Opal from Bemia, Madagascar
Twenty-two gem opals from a new volcanic deposit located near Bemia
Opal from Queretaro, Mexico: Occurrence and Inclusions
An examination of play-of-color opal from Mexico and its variety of inclusions.
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.
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.