Distinctive Feather in Diamond
A feather observed in a natural diamond resembles a large reptile.
Carbon Dioxide in a Brown Diamond
The Carlsbad lab examines a rare submission of a Fancy Dark brown diamond containing carbon dioxide.
Gems Recovered from Sedimentary Rocks
Explores the formation of sedimentary rocks, gems found and formed in sedimentary environments, and the alluvial mining of these gems.
Texas Topaz, Slovak Opal, a Beryl Inclusions Chart, and More
An overview of the Winter 2023 Gems & Gemology content.
Topaz from Mason County, Texas
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.
Slovak Opal: A New Life for a Historical Gem
Reports on the recent production of precious and common opal from a centuries-old locality.
Micro-Features of Beryl
Provides a visual guide to the internal features of different varieties of beryl.
A Unique Petrified Tree Fern from Northeast China
Documents the gemological properties, chemical composition, and appearance of petrified tree fern discovered in northeast China.
An Unusual Partially Non-Nacreous Pinctada radiata Natural Blister Pearl
A large Pinctada radiata natural blister pearl displays a unique reaction under long-wave ultraviolet light.
Seed Pearls in an Antique Indian-Style Headdress
GIA’s Mumbai laboratory analyzes seed pearls decorating an Indian-style headdress.
Tubular Feature in a Natural Pearl
Investigation of a tubular feature in a natural pearl reveals evidence of parasitic activity.
Exquisite Butterfly in Diamond
A crystal inclusion with a stress halo resembles a colorful butterfly in a 1.01 ct diamond.
Octahedral Gahnospinel Crystal in Sri Lankan Blue Sapphire
A rare octahedral gahnospinel crystal is observed in Sri Lankan sapphire.
Bohemian Garnets as Decorative Materials for Glass Vessels from the Late Sixteenth to Early Eighteenth Centuries
Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.
GIA推出Gemolite®NXT显微镜
GIA美国宝石研究院最新推出的Gemolite®NXT宝石学显微镜刷新宝石业的标准，这款新品现可供选购，GIA特别在整个AGTA GemFair Tucson珠宝展期间提供限时折扣，欢迎访客购买。有兴趣的客户请访问store.GIA.edu登记加入关注名单。
GIA推出Gemolite®NXT显微镜
GIA美国宝石研究院最新推出的Gemolite®NXT宝石学显微镜刷新宝石业的标准，这款新品现可供选购，GIA特别在整个AGTA GemFair Tucson珠宝展期间提供限时折扣，欢迎访客购买。有兴趣的客户请访问store.GIA.edu登记加入关注名单。
GIA Same-Day Report Confirmation Service Available in New York
The GIA New York laboratory is now accepting GIA graded diamonds for the same-day confirmation service that was announced on January 9.
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