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Published By Gemological Institute Of America

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scholarly journals Purple Gem Spinel from Vietnam and Afghanistan: Comparison of Trace Element Chemistry, Cause of Color, and Inclusions

2021 ◽  
Vol 57 (3) ◽  
pp. 228-238
Author(s):  
Philippe Belley ◽  
Aaron Palke
Keyword(s):  
Trace Element ◽  
Trace Element Chemistry ◽  
Element Chemistry

scholarly journals Persian Turquoise: The Ancient Treasure of Neyshabur

2021 ◽  
Vol 57 (3) ◽  
pp. 240-257
Author(s):  
Bahareh Shirdam ◽  
Andy Shen ◽  
Mingxing Yang ◽  
Zahra Mokhtari ◽  
Hamed Fazliani

scholarly journals Internal Structures of Known Pinctada Maxima Pearls: Cultured Pearls from Operated Marine Mollusks

2021 ◽  
Vol 57 (3) ◽  
pp. 186-205
Author(s):  
Artitaya Homkrajae ◽  
Nanthaporn Nilpetploy ◽  
Areeya Manustrong ◽  
Nicholas Sturman ◽  
Kwanreun Lawanwong ◽  
...  
Keyword(s):  
Marine Mollusks ◽  
Internal Structures ◽  
Pinctada Maxima ◽  
Cultured Pearls

scholarly journals First Identification of Sudoite in Caribbean Ceramic-Age Lapidary Craftsmanship

2021 ◽  
Vol 57 (3) ◽  
pp. 206-226
Author(s):  
Alain Queffelec ◽  
Ludovic Bellot-Gurlet ◽  
Eddy Foy ◽  
Yannick Lefrais ◽  
Emmanuel Fritsch
Keyword(s):  
Ceramic Age

scholarly journals Pearl Classification: The GIA 7 Pearl Value Factors

2021 ◽  
Vol 57 (2) ◽  
pp. 135-137
Author(s):  
Joyce Wing Han Yo ◽  
Sally Chan Shigh

scholarly journals Detection of Color Treatment and Optical Brightening in Chinese Freshwater "Edison" Pearls

2021 ◽  
Vol 57 (2) ◽  
pp. 124-134
Author(s):  
Chunhui Zhou ◽  
Joyce Wing Yan Ho ◽  
Sally Chan Shih ◽  
Tsung-Han Tsai ◽  
Ziyin Sun ◽  
...  
Keyword(s):  
Color Treatment

scholarly journals Namak Mandi: A Pioneering Gemstone Market in Pakistan

2021 ◽  
Vol 57 (2) ◽  
pp. 138-149
Author(s):  
Habib Ur Rehman ◽  
Bilal ◽  
Syed Owais ◽  
Obaid Ur Rahman ◽  
Andy H. Shen

scholarly journals Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance

2021 ◽  
Vol 57 (2) ◽  
pp. 102-123
Author(s):  
Yun Luo ◽  
David Nelson ◽  
Troy Ardon ◽  
Christopher M. Breeding
Keyword(s):  
Blue Fluorescence

scholarly journals How to Calculate Color from Spectra of Uniaxial Gemstones

2021 ◽  
Vol 57 (1) ◽  
pp. 36-45
Author(s):  
Che Shen ◽  
Aaron C. Palke ◽  
Ziyin Sun ◽  
Mark D. Fairchild

scholarly journals Micro-Features of Spinel

2021 ◽  
Vol 57 (1) ◽  
pp. 46-49
Author(s):  
Nathan D. Renfro ◽  
John I. Koivula ◽  
Shane F. McClure ◽  
Kevin Schumacher ◽  
James E. Shigley
Keyword(s):  
Micro Features
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