Research Article Search Results
CVD-Grown Diamond with an Unusual Blue Band
Checkered Pattern on Diamond
Assembled Bead Cultured Half-Pearl
Investigation in the Carlsbad laboratory reveals a pearl submission is not mabe as initially believed.
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.
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.
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.
Update on Montana’s Rock Creek Sapphire
Applications of X-Ray Radiography and X-Ray Computed Microtomography in Gemology
X-ray imaging techniques revolutionized pearl testing by enabling gemologists to distinguish natural from cultured pearls through detailed visualization of their internal structures, evolving from film-based systems in the early 1900s to today’s sophisticated digital equipment.
Classification of Gem Materials Using Machine Learning
Explores the application of several machine learning models to complement traditional gem classification approaches.
Two Imitation Melo Pearls
GIA’s Hong Kong and Bangkok laboratories report on imitation pearls with a striking resemblance to natural Melo pearls.
“Cotton Pearl” Imitations
An in-depth look at a new pearl simulant gaining popularity in the fashion jewelry market.
