Purple to Purplish Red Chromium-Bearing Taaffeites
Gemological, microscopic, chemical, and spectroscopic properties are given for eight purple to purplish red chromium (Cr)- and iron (Fe)-bearing taaffeites and, for comparison, two grayish violet Fe-bearing but Cr-free samples.
Gem Garnets in The Red-To-Violet Color Range
This article shows that the characteristic of color appears to have little correlation with variations in bulk (not trace) composition or physical properties.
Identification of the Endangered Pink-To-Red Stylaster Corals by Raman Spectroscopy
All corals within the Stylasteridae family (including the Stylaster genus) are listed in Appendix II of CITES.
Bohemian Garnet – Today
Red garnets have been mined in the Bohemian Hills of Czechoslovakia since the 16th century.
Unusual Faceted Massive Fuchsite
An unusually large faceted fuchsite, the chromian variety of muscovite, was identified and its green color explained.
Synthetic Emeralds Grown by Richard Nacken in the Mid-1920s: Properties, Growth Technique, and Historical Account
Describes the chemical, morphological, and microscopic properties of the first gem-quality synthetic emeralds ever produced, offering a historical perspective on their development.
Photoluminescence Spectra of Emeralds from Colombia, Afghanistan, and Zambia
Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
Aquamarine from the Masino-Bregaglia Massif, Central Alps, Italy
Aquamarine from granitic pegmatites of the Masino-Bregaglia Massif, Central Alps, Italy.
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Abstracts; Winter 1996
This article, from the Winter 1996 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.