GIA has announced the release of the Winter 2023 Gems & Gemology (G&G) issue. Recent discoveries and captivating insights in the latest issue of G&G include a comprehensive look at a prized gemstone from the United States, examines a technique for setting cut garnets on glass objects and shares about the properties and appearance of a petrified tree fern from northeast China.
This and every issue of G&G since 1934 are available at no cost on GIA’s website at GIA.edu/gems-gemology.
Winter 2023 G&G feature articles:
Topaz from Mason County, Texas
Roy Bassoo, Diane Eames, Matthew F. Hardman, Kenneth Befus, and Ziyin Sun
A comprehensive look at Texas topaz, detailing its gemological and compositional characteristics and providing a basis for using trace element concentrations to identify its origin.
Bohemian Garnets as Decorative Materials for Glass Vessels from the Late Sixteenth to Early Eighteenth Centuries
Karl Schmetzer, Hans Albert Gilg, and Hans-Jörg Ranz
Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.
A Unique Petrified Tree Fern from Northeast China
Ying Yan, Xiao-Yan Yu, Han-Yue Xu, and Zhi-Rong Xie
Documents the gemological properties, chemical composition, and appearance of petrified tree fern discovered in northeast China.
Slovak Opal: A New Life for a Historical Gem
Reports on the recent production of precious and common opal from a centuries-old locality.
Chart: Micro-Features of Beryl
Nathan Renfro, Tyler Smith, John I. Koivula, Shane F. McClure, Kevin Schumacher, and James E. Shigley
Provides a visual guide to the internal features of different varieties of beryl.
G&G’s regular features include:
- Lab Notes provides updates, including information about an HPHT-treated laboratory-grown diamond and an antique Indian-style headdress decorated with seed pearls.
- Micro-World showcases the inner landscapes of gemstones such as hollandite crystals in a Brazilian amethyst.
- Colored Stones Unearthed covers the formation and mining of gemstones from sedimentary rocks.
- Gem News International includes reports such as information about pyritized triceratops fossils from South Dakota.
Join the conversations on GIA’s Gems & Gemology Facebook group with an online community of nearly 40,000 members: facebook.com/groups/giagemsgemology. Additional research articles are available at GIA.edu/gia-news-research.