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Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.

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Multi-colored gems are superimposed on an image of glacier peaks.
Article
Gems and Minerals from the Subarctic

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

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Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

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The Cause of Iridescence in Rainbow Andradite from Nara, Japan
The Cause of Iridescence in Rainbow Andradite from Nara, Japan

“Rainbow” andradite from Nara, Japan, occurs as relatively small orangy brown crystals that show attractive iridescence in almost the entire range of the spectrum.

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Pastel Pyropes
Pastel Pyropes

Pyrope garnets occur in near-colorless to light orange and pink, as well as the familiar red.

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Pyrope-Spessartine Garnets with Unusual Color Behavior

Unusual color-change garnets.

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Gem Andradite Garnets

Gem-quality andradites are easy to distinguish chemically from other types of gem garnets.

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Gem-Quality Grossular Garnets

The gemological classification and identification of gem grossular garnets is examined.

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Two Notable Color-Change Garnets

The gemological properties and chemical compositions of two unusual color-change garnets are reviewed.

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Gem Garnets in The Red-To-Violet Color Range

This article shows that the characteristic of color appears to have little correlation with variations in bulk (not trace) composition or physical properties.

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