Diamondiferous Mantle Eclogite: Diamond Surface Features Reveal a Multistage Geologic History
Gübelin Gem Museum Opens in Switzerland
A Newly Discovered Iridescent Andradite from Inner Mongolia, China
An Environmental, Social, and Governance Assessment of Marine Pearl Farming
A look at the sustainability challenges and opportunities facing marine pearl farming using an Australian pearl farm as a case study.
Mining Basalt-Related Gems in Southeast Vietnam
Gems from seven gemstone occurrences identified within the basaltic fields in southeast Vietnam are analyzed.
Shell Blister on an Isognomon isognomon Shell
An Isognomon isognomon shell with a blister feature is examined at GIA in Mumbai.
The Special Color Effect in “Chameleon” Amber
An examination of three Burmese chameleon amber specimens using 3D fluorescence spectroscopy.
Iridescent Inclusion in Brown Diamond
An iridescent crystal with a stress halo is observed in a light brown diamond.
Natural Diamond with Twinning Wisps Resembling a Whale
Examination of a round brilliant diamond reveals twinning wisps in the formation of a whale.
Tourmaline in Emerald
Examination of a Zambian emerald reveals prismatic black tourmaline inclusions.
Survey of Colored Stone Preferences Among Younger Generations
An online survey assesses current colored stone preferences in consumers under 35.
CVD “Etch” Channel
The first report of an etch channel–like structure in a CVD laboratory-grown diamond submitted to GIA.
CVD-Grown Diamond with Few Diagnostic Features
A CVD-grown diamond submitted to GIA requires very careful examination to determine its origin.
Natural Diamond with Unusual Phosphorescence
A rare observation of spatially distinct red and greenish blue phosphorescence in a natural diamond.
Natural Type IIa Diamond with Unusual Red Fluorescence Distribution
“Nebula” Inclusion in Ruby Beryllium-Diffused to Heal Fractures
Pearls in Traditional Indian Nose Rings
Breyite in Diamond
Spray of Columbite Crystals in Topaz
A cluster of bladed columbite crystals is identified in colorless topaz.
Turquoise Planet Earth
A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.