New Production of Brazilian Emerald from Minas Gerais
Emerald from the Belmont and Montebello mines of Minas Gerais, Brazil seen at the GJX show in Tucson.
Colored Gems, Chinese Jewelry Designers, and Colored Diamond Spectra
The Chinese Soul in Contemporary Jewelry Design
Chrysocolla In Quartz
A gemological examination of chrysocolla in quartz from Tucson’s AGTA show.
Chinese Freshwater Pearl Culturing, Overall Market Summary
Dumortierite in Rock Crystal Quartz
Prismatic blue and colorless dumortierite inclusions in rock crystal quartz are examined for the first time in the Carlsbad lab.
Mozambique: A Ruby Discovery for the 21st Century (英语)
Explores the geology, production, and yield of the world’s most commercially important ruby deposit.
Large and Unusual Gems
High-End Colored Gems
Ginger Garnet, “Fancy” Tanzanite
Visible Absorption Spectra of Colored Diamonds
Exceptional Red Spinels and Fine Aquamarine
HPHT Synthetic Diamond Melee in High-Quality Jewelry Piece (英语)
The New York lab discovers a synthetic melee diamond in a pendant, underscoring the importance of testing for undisclosed synthetics.
Large HPHT-Grown Synthetic Diamonds Examined in GIA’s Hong Kong Laboratory (英语)
Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.
Conservation Concerns over Use of Tridacna Shell in Imitation Pearls
The New York lab investigates the use of the shells of Tridacna species as imitation pearls.
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