Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report.
Gems and Minerals from the Subarctic
Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
The blue cap termination from a tourmaline crystal was preserved and polished, yielding a unique designer gem.
Stars Are Out in Paraíba Tourmaline
Rare material from Brazil features four-ray stars under point-source light.
Bicolor Double-Eye Tourmaline
A tourmaline displaying different colors of chatoyancy on opposite sides of a double cabochon is examined.
Copper and Tenorite Inclusions in Cuprian-Elbaite Tourmaline from Paraíba, Brazil
Inclusions of native copper and tenorite (CuO) were found in grayish green elbaite from São José da Batalha, Paraíba, Brazil.
Interesting Red Tourmaline from Zambia
A new source of red tourmaline is identified in Zambia.
Tourmaline as an Inclusion in Zambian Emeralds
A report on Zambian emeralds with tourmaline inclusions.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
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.