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Demantoid from Val Malenco, Italy
Demantoid from Val Malenco, Italy: Review and Update

New data are presented for demantoid from Val Malenco, Italy, as obtained by classical gemological methods.

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Peridot
Article
GIA Tests Extraterrestrial Gemstones for Down-to-Earth Elements

While scientists speculate about diamond planets hurtling through the galaxy, at least one extraterrestrial gemstone is already among us.

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Ruby and Sapphire Production and Distribution: A Quarter Century of Change
Ruby and Sapphire Production and Distribution: A Quarter Century of Change

During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges.

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Mineral Treasures of the Ozarks Book Cover
Books: Mineral Treasures of the Ozarks

Review of Mineral Treasures of the Ozarks, by Bruce L. Stinchcomb.

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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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Dr. Gaston Giuliani
IMA General Meeting

A summary of gemological presentations from the 21st IMA General Meeting in Johannesburg.

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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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Fall 2002 G&G Book Reviews

“From Mine to Mistress: Corporate Strategies and Government Policies in the International Diamond Industry”; “Light & Stone: Highlights from the Scott Gem Collection”; “Gemstones Quality and Value, Volume 2”; “Murzinka: Alabashka Pegmatite Field”; “Gemstones and Other Unique Minerals and Rocks of Wyoming: A Field Guide for Collectors”

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Ammolite: Iridescent Fossilized Ammonite from Southern Alberta, Canada

Ammolite is a form of aragonite that is obtained from vivid iridescent fossilized ammonite shells mined in Alberta, Canada.

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Gem-Quality Haüyne from the Eifel District, Germany

Haüyne is a rare mineral and an extremely rare gemstone. Recently, the authors studied a large number of faceted haüynes from the Eifel district of Germany.

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