Research Article Search Results
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.
Filled Natural Hollow Heart-Shaped Pearls
Examination of four heart-shaped pearls reveals cavity filling and plugging to improve durability.
Converge 2025 Speaker Presentations
A summary of presentations from 24 industry-leading experts at Converge.
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 GIA Hands-On Sessions
GIA offered a variety of hands-on sessions for attendees during the Converge conference.
Converge 2025 Poster Presentations
An overview of more than 30 posters presented at the Converge conference.
“Worms” in Opal
Near-colorless heulandite crystals in an Ethiopian opal resemble the segmented bodies of worms.
Whimsical Growth Tubes in Tourmaline
Microscopic examination reveals intriguing growth tubes in a copper-bearing tourmaline.
Tourmaline in Tourmaline
A perfectly shaped euhedral tourmaline crystal is identified in a faceted tourmaline.
Dark Red Tantalite Crystal in Greenish Blue Sapphire
The blunt termination of a red manganotantalite inclusion displays a striking contrast against a greenish blue sapphire.
Intriguing Sapphire from Montana, a New Source of Emerald in Central China, and Arkansas Turquoise
Mannardite in Quartz
Fibrous mannardite crystals are observed in three colorless quartz samples.
