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January 2023

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Tanzanite, Turquoise and Zircon: A Winter Wonderland of Blue Gems

December Birthstone

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Geographic Origin of Diamond,
Sapphire from China, and Gems on Canvas

New Gems & Gemology Issue

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On Campus Program

Gemology & Jewelry Design

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featured

Research & News

Pigment powders and their sources.
Feature

Gems on Canvas

Explores the use of gem materials as pigments in works of art, from the earliest cave paintings to the modern era.
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Knowledge Session Webinars
Webinar Series

GIA Knowledge Sessions

Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
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Small trigons and a rough surface texture seen on a chondrodite crystal.
Micro-World

Chondrodite in Red Spinel from Mogok, Myanmar

The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin.
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Diamond (left) and emerald (right) lenses.
Lab Notes

Two Antique Mughal Spectacles with Gemstone Lenses

Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.
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“Healing Sisters” rings featuring amethyst and peridot.
Colored Stones Unearthed

Colored Stones from the Deep

The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.
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A 2.42 ct green diamond treated by radioactive salts.
Micro-World

Radioactive Green Diamond

The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.
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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