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Summer 1991 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
Nano-Polycrystalline Diamond Sphere: A Gemologist’s Perspective
Synthetic nano-polycrystalline diamond is one of the latest and most exciting results of scientific efforts to synthesize a mineral that has held the fascination of humankind for ages.
A “Galaxy” within a Diamond
Tiny crystal and particle cloud inclusions resemble a galaxy in a 2.01 ct diamond.
Artisanal Diamond Mining: Addressing the Knowledge Gap
Diamonds for Peace conducts basic training on rough diamond grading for artisanal miners in Liberia.
A History of Diamonds through Philately: The Frank Friedman Collection
South African jeweler Frank Friedman’s collection of diamond-themed stamps and other postal material offers an illuminating visual record of diamond history.
The Discovery of Davemaoite, the CaSiO3 Perovskite, in a Diamond from Earth’s Lower Mantle
Davemaoite identified in a diamond from Orapa, Botswana.
CVD “Etch” Channel
The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.
10 ct HPHT-Treated CVD Laboratory-Grown Diamond
Testing a 10 ct CVD laboratory-grown diamond reveals evidence of HPHT treatment.
Marine Mining of Diamonds off the West Coast of Southern Africa
Kyanite: A Rare Blue Guest in Diamond
Fall 1983 G&G; Lab Notes
This section, from the Fall 1983 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
