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December Birthstone

Turquoise: Health, Wealth and Protection

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Courtesy of: Andrew Sarosi, L.A., Ca.
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Value Factor Series

Gem Cutting Styles

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Feature Article

Metalwork Techniques that Enhance Gemstone Jewelry

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Research & News

A large piece of rough, left, with a portion cut out of it, and six cut and polished diamonds produced from the cut out piece of rough.
Industry Analysis

Chipping Away at the 1,109 ct Lesedi La Rona

Graff reveals the first polished diamonds produced from the Lesedi La Rona, one of the largest pieces of rough ever mined. Plus, other market news.
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Reviews

Dreher Carvings: Gemstone Animals from Idar-Oberstein

Review of Dreher Carvings: Gemstone Animals from Idar-Oberstein by Wilhelm Lindemann, Will Larson, and Ekkehard Schneider.
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This 15.32 ct cushion modified brilliant is the largest HPHT synthetic diamond graded by GIA.
Lab Notes

15 Carat HPHT Synthetic Diamond

A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.
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Two white jade bracelets with dark color patches.
Gem News International

Nephrite Bracelet with Filled Cavity

A jade bracelet contains unusual fillers, used to create a smooth surface.
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Chatoyancy on one side of green bead.
Lab Notes

Cat’s-Eye Rock Consisting of Jadeite and Amphibole

Raman spectroscopy reveals that a green bead, showing chatoyancy on one side, comprises jadeite and amphibole.
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Parallel bands of green color at room temperature.
Micro-World

Uncommon Parallel Color Zoning in a Chameleon Diamond

A diamond examined in the Carlsbad lab shows chameleon coloring in an unusual pattern.
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Learn & Connect

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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

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