Unheated and Unusual Colors
The Seven Types of Yellow Sapphire and Their Stability to Light
Coated Fire Opal in the Chinese Market
Tugtupite: A Gemstone from Greenland
Introduction to the Micro-World of Gems
The Santa Terezinha De Goias Emerald Deposit
A Remarkable 16.71 ct Transparent Orange-Yellow Sodalite
An Examination of Four Important Gems
Several famous and historical gemstones in the Smithsonian's collection are examined and reported on.
Ancient Script-Like Serpentine in Brown Peridot
Quartz Assemblage Imitating Emerald
Sapphire and Garnet from Kalalani, Tanga Province, Tanzania
