News & Articles

Gems & Gemology Spring 2024 In Brief
Spring 2024 G&G Available Now

An overview of the Spring 2024 Gems & Gemology content.

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Figure 1. A fine 925 ct crystal that was formerly displayed in the Texas State Capitol and sat on the governor’s desk in 1969 when the legislature adopted blue Texas topaz as the state gem. This specimen was found in 1904 and now resides in the Hamman Gem and Mineral Gallery in the Department of Earth and Planetary Sciences at the University of Texas at Austin (catalog no. B0344). Photo by Blanca Espinoza.
G&G Features in a Flash: Texas Topaz

Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.

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Figure 1. This 2.20 ct Fancy Deep brownish orange treated HPHT-grown diamond owes its distinctive appearance to multiple defect concentrations created within the various growth sectors. Photo by Diego Sanchez.
New and Notable Finds from the GIA Lab: Winter 2023

Discover a bicolor chameleon diamond, a diamond with carbon dioxide, and a pink square inside a diamond.

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Sun setting over water in Northern Madagascar
Gems of Northern Madagascar Video with GIA Field Gemology

Madagascar, a gemstone wonder, is explored by GIA's Field Gemology Manager, Wim Vertriest. He retraces the island's gemstone history and shares experiences from a recent expedition to two remote mines in Northern Madagascar: a demantoid and a sapphire mine.

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Hand holding demantoid garnet rough in matrix.
The Latest in Field Gemology from Wim Vertriest: Sapphires and Demantoid Garnets from Northern Madagascar

Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.

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Gems & Gemology Winter 2023 In Brief
Winter 2023 G&G Available Now

An overview of the Winter 2023 Gems & Gemology content.

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