GIA has announced the release of the Fall 2022 Gems & Gemology (G&G) issue. G&G Fall examines the methods and challenges of establishing the geographic origin of diamonds, looks at a source of sapphire in Northeastern China, explores the use of gem materials as pigments in works of art, and investigates the unique color mechanism and spectroscopic thermal variation of pink spinel from Tajikistan.
This and every issue of G&G since 1934 is available at no cost on GIA’s website at GIA.edu/gems-gemology.
Fall 2022 G&G featured articles:
Methods and Challenges of Establishing the Geographic Origin of Diamonds
Evan M. Smith, Karen V. Smit, and Steven B. Shirey
Examines the current available means of determining the geographic origin of gem-quality diamond, which are based largely on trace element and isotopic characteristics. For now, no method exists for determining the provenance of a random individual diamond.
Sapphire Beneath the Rich Black Soil of Muling, Northeastern China
Yimiao Liu and Ren Lu
A comprehensive look at the gemological features and advanced analysis of blue and fancy-color sapphire from the agricultural area of Muling, China.
Gems on Canvas: Pigments Historically Sourced from Gem Materials
Explores the use of gem materials as pigments in works of art, from the earliest cave paintings to the modern era.
Color Mechanism and Spectroscopic Thermal Variation of Pink Spinel Reportedly from Kuh-i-Lal, Tajikistan
Yicen Liu, Lijian Qi, Dietmar Schwarz, and Zhengyu Zhou
A detailed spectroscopic investigation of the color of pink spinel reportedly from the Kuh-i-Lal deposit in the Pamir Mountains of Tajikistan.
G&G’s regular features – Lab Notes, Micro-World and Gem News International – continue to highlight interesting gemological findings from around the world. And discover the variety of fluid inclusions in natural diamond in the G&G Diamond Reflections section.
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