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Turquoise

Azure sky, robin’s egg blue: Vivid shades of turquoise define the color that’s named after this gem.

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Cabochon

This turquoise is cut in a cabochon: the most common shape.

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Robin’s egg

The preferred color for turquoise is a pure sky blue.

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Matrix

Some buyers prefer the presence of matrix in fashioned turquoise.

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Aggregate

Turquoise is an aggregate of microscopic crystals that form a solid mass.

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Copper

The intense blue color in this rough is due to the presence of copper.

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Veins

Veins of matrix in this turquoise are remnants of its surrounding rock.

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Tools

Research

Cross section of one bead showed barite, minor calcite, and a black filling.
Barite-Calcite Composite as Imitation “Wulanhua” Turquoise from Hubei Province, China

“Wulanhua” turquoise bracelet identified as composite material made of barite, calcite, and blue dye.

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Ring with Neyshabur turquoise
Persian Turquoise: The Ancient Treasure of Neyshabur

Reports on the geology, background, and current state of mining and production at Iran’s largest turquoise mine.

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Massive blue turquoise from the mine in Hubei Province
Unique Raindrop Pattern of Turquoise from Hubei, China

Presents spectroscopic and chemical analysis of a new variety of turquoise with a rare raindrop pattern with saturated colors.

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Gem materials and in front of rare books.
Article
Top 10 Digital Reads from the GIA Library

Explore GIA’s collection of free, rare digital books and manuscripts that document the history of gems and jewelry.

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A large red-orange crystal of wulfenite is nestled in the arms of matrix.
Article
Arizona Road Trips: Wild West Gem and Mineral Localities

Arizona’s scenic desert and mountain landscape is the perfect backdrop for a modern Wild West road trip in search of gem and mineral treasures.

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Recent production of turquoise from Polk County, Arkansas
Turquoise from Western Arkansas

A report on turquoise from the only known U.S. deposit outside of the Southwest.

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The gems spell out “The 2000th Gem Stone Design.”
Article
Gemstone ‘Paintings’ Tell Story of a Master Craftsman, Gem and Jewelry Mentor

A jeweler who quietly built a circle of inspiration and influence lives on in generations of GIA-educated jewelers and gemologists.

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Starlet in sunglasses above title “Hooray for Hollywood
Article
M.D. Hohenstine’s Gem Displays: The Process of Creating Popular Window Art with Loose Gemstones

Jeweler M.D. Hohenstine’s spectacular window displays were a beloved tradition in downtown Columbus, Ohio, for more than 50 years.

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Remedios, home of rutilated quartz mining community.
Golden Rutilated Quartz Artisanal Mining Community

Plans to develop a collective in a remote Brazilian rutilated quartz mining community are unveiled.

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Handmade Starship Enterprise
“Boldly Go” with a Southwest-Inspired Starship Enterprise

An eye-catching replica from a cult TV favorite is found in Tucson.

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