Article Search Results

Beryllium Diffusion of Ruby and Sapphire

John L. Emmett, et al., June 1, 2003

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

Ruby and Sapphire from Jegdalek, Afghanistan

Gary W. Bowersox, Eugene E. Foord, June 1, 2000

This study provides detailed mining and gemmological information on the Jegdalek deposit, in east-central Afghanistan, which is hosted by elongate beds of corundum-bearing marble.

Sapphire and Garnet from Kalalani, Tanga Province, Tanzania

Antonin V. Seifert and Jaroslav Hyrsl, June 1, 1999

Located just 3 km south of the famous Umba locality, the geologically similar Kalalani area hosts deposits of gem-quality sapphire.

Tairus Hydrothermal Synthetic Sapphires Doped with Nickel and Chromium

Victor G. Thomas, Rudolf I. Mashkovtsev, September 1, 1997

Researchers from the Tairus joint venture have developed the technology for the hydrothermal growth of gem-quality crystals of synthetic sapphire.

Sapphires from the Andranondambo Region, Madagascar

Dietmar Schwarz, Eckehard J. Petsch, June 1, 1996

Since 1993, large amounts of gem-quality sapphires from the Andranondambo region of southern Madagascar have entered the international gem market.

An Examination of Four Important Gems

C. W. Fryer and John I. Koivula, June 1, 1986

Several famous and historical gemstones in the Smithsonian's collection are examined and reported on.

Sri Lanka: The Gem Island

Peter C. Zwaan, June 1, 1982

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

The Effects of Heat Treatment on Zircon Inclusions in Madagascar Sapphires

Wuyi Wang, Kenneth Scarratt, John L. Emmett, Christopher M. Breeding, and Troy R. Douthit

Zircon inclusions in sapphires from Madagascar were studied to investigate the effects of heat treatment on their gemmological and spectroscopic features.

Article Search Results

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Gemstones

Article Search Results

Types

Content Type

Reviewed

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Gemstones

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