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Dalmatian stone samples
True Colors of “Dalmatian Jasper”

Discusses the mineralogical composition and provenance of this spotted decorative gemstone.

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Necklaces, pendants, statuette, and slab of serpentine
Gem-Quality Serpentine from Val Malenco, Central Alps, Italy

A detailed characterization of serpentine from this mountain locality, focusing on its use as a gem material.

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Two variscite cabochons from central Tajikistan
Variscite from Central Tajikistan: Preliminary Results

A look at the gemological properties and chemical composition of this light blue to light green to green gem material, which is suitable for cabochon cutting.

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Coated lawsonite pseudomorphs coated to resemble chromian lawsonite
Coated Lawsonite Pseudomorphs Presented as Chromian Lawsonite

Samples composed of lawsonite pseudomorphs were coated to make them appear deep green and imitate chromian lawsonite crystals.

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Banded Mimetite

Yellow transparent mimetite—known to collectors as one of the rarest faceted stones—purchased in Tuscon and likely from Bolivia.

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Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines
Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique

Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report.

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Fall 2016 Gems & Gemology Cover
Article
Fall 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Color Change in Blue Zircon

A summary of the content found in the Fall 2016 issue of Gems & Gemology.

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Evan Smith studies images of diamond inclusions on a computer.
Article
Postdoctoral Program Gives Scientists Access to Rare Research Opportunities

GIA’s postdoctoral program gives researchers access to gemological data, equipment and rare, unusual and large gems in its laboratories.

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Peridot from Sardinia, Italy
Characterization of Peridot from Sardinia, Italy

Gem-quality peridot is occasionally found as mantle xenoliths within basalts near Pozzomaggiore.

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Hydrogen-rich Diamonds
Gray-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia

The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds colored gray to blue to violet.

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