A New Gem Material from Greenland: Iridescent Orthoamphibole
A Gem-Quality Iridescent Orthoamphibole from Wyoming
Update on Ammolite Production from Southern Alberta, Canada
Ammolite: Iridescent Fossilized Ammonite from Southern Alberta, Canada
Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color
DNA Barcoding and Next-Generation Sequencing (NGS) of Freshwater Pearls
Nigerian Gems and Jewelry
Mina Stones promotes Nigerian gems including rubellite and sapphire as well as reviving traditional skills and symbols in the creation of original jewelry.
Fluorescence Spectroscopy for Colored Pearl Treatment Screening
A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.
Reversible Twinning in Neodymium Pentaphosphate
Application of slight pressure perpendicular to the twinning planes reveals the unusual property of this synthetic gem.
Staurolite in Ruby
Bismuthinite Inclusions in Rose Quartz from Madagascar
Heat Treating Corundum: The Bangkok Operation
Tugtupite: A Gemstone from Greenland
Kashmir Sapphire
The history of the Kashmir mines, the beautiful sapphires found there, and the outlook for the future.
Gem-Bearing Pegmatites: A Review
A survey of the current gemological knowledge of pegmatites, including the gem varieties aquamarine, tourmaline, and topaz.
Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Araçuaí Districts
First in a series, this article reviews the exploration for gemstones and mining methods in Minas Gerais, Brazil.
Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Governador Valadares District
An Examination of Four Important Gems
Several famous and historical gemstones in the Smithsonian's collection are examined and reported on.
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