Winter 2015 - Volume 51, Issue 4
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Rough rubies from Zahamena National Park in Madagascar.
Rubies from a New Deposit in Zahamena National Park, Madagascar

A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.

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GSA 2015 Annual Meeting

A report summarizing the annual meeting of the Geological Society of America in Baltimore.

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Grandidierite sample from Madagascar
Grandidierite from Madagascar

An unfamiliar rough fragment acquired from Madagascar may point toward a new source of grandidierite.

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Demantoid crystal with two-phase fluid inclusion
Demantoid Garnet with Giant Fluid Inclusion

A large fluid inclusion within a demantoid garnet from Madagascar provides insight into the source’s mineralization.

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Chalcedony marketed under the name “Aquaprase.”
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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34th International Gemmological Conference

A report from the 34th IGC, held in Vilnius, Lithuania in August 2015.

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Dr. Carlos Julio Cedeño at the International Emerald Symposium
First International Emerald Symposium

A report from the First International Emerald Symposium, held in Bogotá in October 2015.

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Comparison of golden coral and plastic beads
Golden Coral Imitated by Plastic

A bracelet created to simulate the properties of golden coral is proven to be a plastic imitation.

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Demantoid from Veracruz State, Mexico
Mexican Demantoid from New Deposits

Skarn deposits in the Veracruz state of Mexico yield new demantoid material.

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