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How GIA Analyzes Colored Stones from Start to Finish
GIA developed this guide so retailers can use fluorescence tests to help identify gems right in their own stores.
Exceptional Nacre Thickness of Hybrid Akoya Bead Cultured Pearls
Ben Kho: From Rough Beginnings to Brilliant Mastery
Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.
Structures Behind the Spectacle: A Review of Optical Effects in Phenomenal Gemstones and Their Underlying Nanotextures
Provides a comprehensive summary of the special optical effects in gemstones, including opalescence, chatoyancy, asterism, schiller, and iridescence, and investigates the submicron inclusions and nanotextures in each type of phenomenal stone.
Gem Granitic Pegmatites
Describes the geology, mineralogy, and formation of granitic-composition pegmatites and provides a summary of their worldwide occurrences.
How-To Guide: Testing Diamonds and Gems using UV Light
GIA developed this guide so retailers can use fluorescence tests to help identify gems right in their own stores.
Enormous South Sea Cultured Pearl with Filled and Partially Hollow Structure
Examination of a gigantic South Sea bead cultured pearl reveals an intriguing internal structure.
Natural Non-Nacreous Pearls from Various Marine Mollusks
The Bangkok laboratory studies 35 loose non-nacreous pearls from a wide range of marine mollusk species.
Emeralds in Catherine de’ Medici’s Pendant: An Unexpected Geographic Origin
Archival research and gemological characterization reveal the geographic origin of two emeralds set in a pendant linked to Catherine de’ Medici, Queen of France from 1547 to 1559.
A Study of the Winston Red: The Smithsonian’s New Fancy Red Diamond
Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.