See Gem As
Tools
Research
CVD “Etch” Channel
The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.
CVD-Grown Diamond with Few Diagnostic Features
A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.
Natural Diamond with Unusual Phosphorescence
A rare observation of spatially distinct red and greenish blue phosphorescence in a natural diamond.
Natural Type IIa Diamond with Unusual Red Fluorescence Distribution
Breyite in Diamond
Iridescent Inclusion in Brown Diamond
An iridescent crystal with a stress halo is observed in a light brown diamond.
Natural Diamond with Twinning Wisps Resembling a Whale
Examination of a round brilliant diamond reveals twinning wisps in the formation of a whale.
Diamondiferous Mantle Eclogite: Diamond Surface Features Reveal a Multistage Geologic History
Yellow HPHT-Processed Rough Diamond
A Solution to Diamond Color Grading Problems
Abstracts; Spring 1991
This article, from the Spring 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.
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.
