Dyed Bone as a Red Coral Imitation
A specimen presenting as red coral is revealed to be dyed bone.
Amber with Insect-Bearing Filling
Natural amber beads were found to have been filled with plastic and a variety of insects.
Boron Carbide: A New Imitation of Black Diamond
The Gem Testing Laboratory in Jaipur identified a black diamond-like specimen as boron carbide, a ceramic material typically used in nuclear, military, and aerospace applications.
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.
One of these contributors (PG) recently acquired a 3.91 ct drop-shaped cabochon, purchased in India as a Larimar imitation, that consisted of a ceramic material.
Abstracts; Spring 2009
This article, from the Spring 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.
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.
Composite Amber with an Unusual Structure
This 9.12 gram amber composite featured a combination of natural and imitation amber, accompanied by natural and artificial insect inclusions.
Boron Carbide: A New Imitation Black Diamond
Specimen sold as black diamond identified as ceramic material commonly used in hard-plating applications