GIA has announced the release of the Summer 2021 Gems & Gemology (G&G). This issue explores the relationship between fluorescence and diamond appearance, takes a deep dive into the world of pearls with advances in color treatment detection and a comprehensive classification system, and documents the evolution of the Namak Mandi gemstone market in Peshawar, Pakistan.
This and every issue of G&G since 1934 is available at no cost on GIA’s website at gia.edu/gems-gemology.
Summer 2021 G&G featured articles:
- Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance
Yun Luo, David Nelson, Troy Ardon, and Christopher M. Breeding
Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.
- Detection of Color Treatment and Optical Brightening in Chinese Freshwater “Edison” Pearls
Chunhui Zhou, Joyce Wing Yan Ho, Sally Chan Shih, Tsung-Han Tsai, Ziyin Sun, Stephanie Persaud, and Li-Jian Qi
Analyzes a group of 23 freshwater “Edison” pearls (a trade name referring to near-round freshwater cultured pearls, usually shell bead cultured) using various gemological and advanced instrumental techniques.
- Pearl Classification: The GIA 7 Pearl Value Factors
Joyce Wing Yan Ho and Sally Chan Shih
Provides a visual guide to GIA’s approach to classifying and describing pearls.
- Namak Mandi: A Pioneering Gemstone Market in Pakistan
Habib Ur Rehman, Bilal, Syed Owais, Obaid Ur Rahman, and Andy H. Shen
Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.
Additionally, G&G’s regular features – Lab Notes, G&G Micro-World and Gem News International – continue to highlight interesting gemological findings from around the world.
Stay ahead of gemological news and join the conversations on GIA’s Gems & Gemology Facebook group with an online community of more than 16,000 members. Additional research articles are available at GIA.edu/gia-news-research.