Amethyst from Newfoundland, Canada: Geology, Internal Features, and Fluid Inclusion Microthermometry
Characterizes gem-quality amethyst from the La Manche deposit in the Avalon Zone of Newfoundland, Canada.
Classification of Gem Materials Using Machine Learning
Explores the application of several machine learning models to complement traditional gem classification approaches.
Gemfields Emerald and Ruby Auctions
Arzakite Inclusion in Ruby from Mogok
Almandine Garnet from Phu Tho, Vietnam
Reports on the study of garnet samples from a source in northern Vietnam.
Gems & Gemology at Ninety: A Look to the Future
The Extraordinary Backstory of Natural Diamonds: A Diamond Is (and Has Been) Forever
Irradiated HPHT-Grown Diamonds with Blue-Green Color Zonation
Green Haüyne
Colored Bands in CVD-Grown Diamond
Splendors from the Deep: Historic Treasures from a Spanish Shipwreck
Zoned Trapiche Emerald with Goshenite Overgrowth
“Out of the Darkness” …and Into the Light of Diamond Fluorescence
New Production of Sapphire from Matepwende, Tanzania
Mineral Assemblage of “Paraíba Matrix”
Helvine Inclusions in Morganite
Master Diamond Cutter Harvey Lieberman
A look at Harvey Liberman’s career as a renowned diamond cutter in New York’s Diamond District.
Iridescent Tubes in Pezzottaite
A large purplish pink pezzottaite with growth banding and tube inclusions is examined in the Carlsbad laboratory.
A Multicore Non-Bead Cultured Pearl
Two Imitation Melo Pearls
GIA’s Hong Kong and Bangkok laboratories report on imitation pearls with a striking resemblance to natural Melo pearls.
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