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Jade Report

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Available from any GIA laboratory worldwide.

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March 2024 Birthstone

Aquamarine: The Gem
of Sirens and Mermaids

March Birthstone

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WN23 G&G Issue Cover

Texas Topaz, Slovak Opal, and a Beryl Inclusions Chart

New Gems & Gemology Issue

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featured

Research & News

Hand holding demantoid garnet rough in matrix.
Field Gemology Update

The Latest in Field Gemology from Wim Vertriest

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

Topaz from Mason County, Texas

A comprehensive look at Texas topaz, detailing its gemological and compositional characteristics and providing a basis for using trace element concentrations to identify its origin.
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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.
Lab Notes

Treated HPHT Laboratory-Grown Diamond with Dramatic Color Zoning

A Fancy Deep brownish orange treated HPHT-grown diamond exhibits multiple defect concentrations in various growth sectors.
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Hollandite crystals inside a natural amethyst from Bahia, Brazil. Photomicrograph by Liviano Soprani; field of view 2.20 mm.
Micro-World

Hollandite in Amethyst

A spectacular display of hollandite crystals is captured within an amethyst cabochon.
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Figure 1. Sedimentary rocks are among the most common rocks exposed on the earth’s surface. This image shows multicolored sandstone layers known as “The Wave” that have been eroded and sculpted by winds to form a swirling pattern of rock strata in the Coyotes Buttes North wilderness area along a portion of the Arizona/Utah border. Photo by Greg Bulla.
Colored Stones Unearthed

Gems Recovered from Sedimentary Rocks

Explores the formation of sedimentary rocks, gems found and formed in sedimentary environments, and the alluvial mining of these gems.
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This 9.885 kg specimen of aquamarine on albite with a quartz cathedral center, measuring 31 × 23 × 28 cm, is from Pakistan’s Shigar Valley. Courtesy of GIA Museum, collection no. 43068. Photo by Robert Weldon.
Chart

Micro-Features of Beryl

Provides a visual guide to the internal features of different varieties of beryl.
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Figure 2. The cut and polished piece of pyritized triceratops fossil on the left weighs 50.5 ct and measures 41.28 × 22.23 mm. The piece on the right weighs 22.5 ct and measures 31.75 × 15.88 mm. Photos by SD Gem & Fossil.
Gem News International

Pyritized Triceratops Fossils from South Dakota

A newfound dinosaur site in the Hell Creek Formation of South Dakota leads to the discovery of pyritized triceratops fossils.
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Gems & Gemology
This Month's

Featured Gems

Featured Gem Peridot
Peridot

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.
Fancy Color Diamond
Fancy Color Diamond

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.
Diamond
Diamond

Diamonds are among nature’s most precious and beautiful creations.
Emerald Bluish Green Stone
Emerald

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.
Featured Gem Citrine
Citrine

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

View the Gem Encyclopedia