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The examined golden sheen sapphires.
Update on Trace-Element Chemical Characteristics of Golden Sheen Sapphire

An update the gemological and chemical characteristics of golden sheen sapphires from Kenya.

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Garnets under daylight-equivalent (left) and incandescent light (right).
Discovery of Color-Change Chrome Grossular Garnets from Ethiopia

The first known group of color-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.

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Horn shaped jewel pendant featuring emeralds, rubies, diamonds and pearls, and shows engravings in Arabic.
Article
Centuries of Opulence: Jewels of India

Learn about the journey of gemstones used to create the fabulous Indian jewelry featured in this special exhibit at GIA in Carlsbad.

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Ringwoodite in diamond, and diamonds in Earth.
Diamonds Help Solve the Enigma of Earth’s Deep Water

The first installment of G&G’s newest section explores how natural diamonds shed light on the mystery of water found in Earth’s deep mantle.

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Four trapiche-like amethyst cabochons.
Trapiche-like Amethyst from Brazil

Four amethyst cabochons are unique due to inclusions that create a trapiche-like appearance.

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Article
Summer 2018 G&G: Diamonds Across the Spectrum, Byzantine Garnet, and Sapphires from Yogo Gulch

A summary of the Summer 2018 issue of Gems & Gemology.

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Book Review: 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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Shells cut into cabochons, along with an intact shell.
Cabochons Fashioned from the Shell of Crassostrea Virginica

The Carlsbad lab examines gem materials fashioned from American oyster shells.

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Sapphire cabochon displaying asterism.
Unique Star Sapphire with Transparent Core

A sapphire cabochon with an unusual appearance is seen at GIA’s Tokyo lab.

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A black star sapphire with one set of golden rays and another set of silver rays.
Twelve-Rayed Star Sapphire from Thailand

A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.

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