Research Article Search Results
Diamond Sources and Production: Past, Present, and Future
Diamond production’s future appears to belong less to Africa and more to Australia, Canada, and the Russian Federation, according to this overview of geologic trends in the industry.
Status of Ruby and Sapphire Mining in the Mogok Stone Tract
Burma, now named Myanmar, has for centuries been considered the world's preeminent source of fine rubies.
Dyed Natural Corundum as a Ruby Imitation
The gemological properties of a new ruby imitation, produced by dyeing natural colorless to pale-colored corundum, are described.
Rubies and Fancy Sapphires from Vietnam
Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.
Spring 1991 G&G Lab Notes
Age, Origin, and Emplacement of Diamonds: Scientific Advances in the Last Decade
Diagnostic Features and Heat Treatment of Kashmir Sapphires
Today, only by combining different gemological tests with years of practical experience, can a conclusive determination of the origin of a sapphire be made.
Majorica Imitation Pearls
This article discusses the history of the Majorica imitation pearl, the manufacturing and marketing processes, and the separation of the Majorica product from its cultured counterparts.
The Identification of Blue Diffusion-Treated Sapphires
Blue diffusion-treated sapphires are becoming more prevalent than ever before.
Emerald and Gold Treasures of the Spanish Galleon Nuestra Señora de Atocha
During the 1970s and 1980s, treasure hunters discovered the centuries-old remains of the sunken Spanish galleons Nuestra Señora de Atocha and Santa Margarita.
