Grandidierite from Madagascar
An unfamiliar rough fragment acquired from Madagascar may point toward a new source of grandidierite.
Rubies from a New Deposit in Zahamena National Park, Madagascar (英語)
A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.
Demantoid Garnet with Giant Fluid Inclusion
34th International Gemmological Conference
A report from the 34th IGC, held in Vilnius, Lithuania in August 2015.
A New Natural-Color Bluish Green Chalcedony
A new type of African chalcedony with the trade name “Aquaprase” shows unique composition and attractive color.
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