Wollastonite in Devitrified Glass Imitating Horsetail Inclusions in Demantoid Garnet
A yellowish green specimen with horsetail-like inclusions is found to be glass rather than demantoid garnet.
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.
Mildly Radioactive Rhinestones and Synthetic Spinel-And-Glass Triplets | Gems & Gemology
Low levels of radioactivity were found in some greenish yellow to yellow-green (peridot-like) synthetic spinel-and-glass triplets, mirror-backed glass rhinestone chatons, and fully fashioned glass rhinestones.
'Cobalt-Blue' Gem Spinels
Similarities between natural spinels — with intense blue color — and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.
Abstracts; Fall 1991
This article, from the Fall 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.
Abstracts; Summer 1991
From the Summer 1991 issue of Gems & Gemology, a summary of important gemology-related articles published in other journals.
Spinel Submitted as Diamond
It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.