The Year of Mineralogy at the Perot Museum
The Perot Museum of Nature and Science promotes public interest in mineral studies with The Year of Mineralogy exhibit.
Pressed Amber Imitation for “Root Amber”
An examination of a beaded bracelet reveals calcite powder to enhance the imitation of natural root amber.
Fall 2022 G&G Available Now
Book Review: Pegmatites and Their Gem Minerals
Book Review: Pegmatites and Their Gem Minerals
Review of Pegmatites and Their Gem Minerals, by Michael Menzies and Jeffrey Scovil.
The Geographic Origin of Diamonds, Sapphire from China, and Pigments Sourced from Gem Materials
An overview of the Fall 2022 Gems & Gemology content.
Natural Diamond with Extensive Network of Etch Channels
Numerous etch channels are observed in a 5.19 ct type IIa natural diamond.
Unusual Cat’s-Eye Omphacite Fei Cui Jade
A unique jade cabochon with vivid green bodycolor and pronounced chatoyancy is examined at a lab in Shanghai.
The Big Find: Celebrating 50 Years of Maine Tourmaline
The historic discovery of a Maine tourmaline source is celebrated through jewelry designs featuring gems unearthed 50 years ago.
Smithsonian’s Great American Diamonds Exhibit
Two impressive diamonds from Arkansas and Colorado are featured in the Great American Diamonds exhibit at the Smithsonian’s National Museum of Natural History.
Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More...
An overview of the Summer 2022 Gems & Gemology content.
Unusual Glass-and-Quartz Triplet Imitation of Emerald
An extremely convincing imitation of emerald is examined in Beijing.
Yellow Sapphires with Unstable Color
A lab in Bangkok shares study on color stability in yellow sapphire.
A Zircon with Strong Photochromic Effect
Photochromic zircon shows significant color change from medium light greenish blue to very dark yellowish green.
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