Fracture-Filled Diamonds Detected in Mounted Jewelry
The Mumbai laboratory reports on a jewelry submission containing fracture-filled diamonds.
Converge 2025 GIA Hands-On Sessions
GIA offered a variety of hands-on sessions for attendees during the Converge conference.
Blooming Bouquet: Thin Films in Russian Emerald
Colorful thin film inclusions are captured within a Russian emerald carving.
100 ct Cuprite with Malachite Inclusions
A large faceted cuprite is examined at the Carlsbad laboratory.
Converge 2025 Poster Presentations
An overview of more than 30 posters presented at the Converge conference.
“Bamboo Forest” in Colombian Emerald
Dense tube inclusions in emerald create a scene reminiscent of a tranquil bamboo forest.
Characterization of Emeralds from Zhen’an County in Shaanxi, China
Presents a comprehensive analysis of the gemological, spectroscopic, and trace element characteristics of a set of Shaanxi emerald samples based on standard and advanced gemological methods.
The Primary Sapphire Occurrence at French Bar Sill Along the Missouri River, Near Helena, Montana
Reports on a new source of primary gem-quality sapphire from Montana, comparing its inclusions and trace element chemistry with those from secondary sources in the state.
Quarterly Crystal: 𝛽-Quartz Morphology in Beryl
An aquamarine crystal from Pakistan contains a pseudomorphic quartz inclusion.
An Evaluation of Turquoise from the Mona Lisa Mine in Arkansas
Examines samples of Mona Lisa turquoise to identify their chemistry and structure, revealing copper as a major elemental component of the material.
Temples and Treasures of Southern Asia: A GIA Museum Exhibit
A photo tour of the GIA Museum’s latest exhibit featuring extraordinary crystals and gems central to the cultures of southern Asia.
Converge 2025 Speaker Presentations
A summary of presentations from 24 industry-leading experts at Converge.
Intriguing Sapphire from Montana, a New Source of Emerald in Central China, and Arkansas Turquoise
An overview of the Winter 2025 Gems & Gemology content.
The Diversity of Gemstone Deposits
Investigates deposits known for producing multiple gemstone species and the conditions that create their distinct geological settings.
Freshwater Akoyas - A Trending Misnomer for Certain Freshwater Pearls
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Low-Temperature Heat Treatment of Corundum and the Behavior of the 3161 cm–1 Infrared Band
A study analyzing the thermal behavior of the 3161 cm–1 IR feature in 10 natural corundum samples from various deposits.
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