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Figure 1. Chalcedony petrified tree fern is carved as an ornamental gem material. This 60 × 40 mm dragon carving has a uniform texture and bright color. Photo by Hai-Long Wang.

A Unique Petrified Tree Fern from Northeast China

Ying Yan, Xiao-Yan Yu, Han-Yue Xu, and Zhi-Rong Xie, January 26, 2024

Documents the gemological properties, chemical composition, and appearance of petrified tree fern discovered in northeast China.

Figure 1. A silver brooch containing a large Slovak opal (77 ct, 34.5 × 25 × 13 mm) and 48 diamonds. The opal was initially purchased for Louis XVIII’s personal collection. In 1824, it adorned the clasp of Charles X’s coronation mantle, and around 1853 it was remounted onto this brooch for Empress Eugénie, which has been preserved. Photo by Peter Semrád; courtesy of the National Museum of Natural History in Paris (inventory no. MNHN 87.44).

Slovak Opal: A New Life for a Historical Gem

Peter Semrád, January 26, 2024

Reports on the recent production of precious and common opal from a centuries-old locality.

Figure 1. Sedimentary rocks are among the most common rocks exposed on the earth’s surface. This image shows multicolored sandstone layers known as “The Wave” that have been eroded and sculpted by winds to form a swirling pattern of rock strata in the Coyotes Buttes North wilderness area along a portion of the Arizona/Utah border. Photo by Greg Bulla.

Gems Recovered from Sedimentary Rocks

James E. Shigley, Roy Bassoo, and Aaron C. Palke, January 26, 2024

Explores the formation of sedimentary rocks, gems found and formed in sedimentary environments, and the alluvial mining of these gems.

Diamond: Genesis, Mineralogy and Geochemistry, Volume 88 in the Reviews in Mineralogy and Geochemistry series, received this year’s Mary B. Ansari Best Geoscience Research Resource Award.

G&G Contributors Awarded for Best Geoscience Research

GIA Staff, January 26, 2024

Several G&G contributors are recognized for their work on the latest volume in the Reviews in Mineralogy & Geochemistry series.

Figure 2. Rectangular step-cut green beryl from the Volyn pegmatite, 190.00 ct and 28.55 × 39.02 × 21.71 mm, with a rough unpolished table containing etch pits. Faceting and photo by Konstantyn Zalizko.

Etch Pits in Heliodor and Green Beryl from the Volyn Pegmatites, Northwest Ukraine: A Diagnostic Feature

Gerhard Franz, Oleksii A. Vyshnevskyi, Volodymyr M. Khomenko, Peter Lyckberg, and Ulrich Gernert, November 3, 2023

Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.

Wallastonite and CaSiO3-breyite in colorless diamond.

Diamond with Cavities Showing Radiation Evidence

Sally Eaton-Magaña and Garrett McElhenny, July 22, 2020

Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.

Hackmanite/Sodalite from Myanmar and Afghanistan

David Kondo and Donna Beaton, May 15, 2009

Significant amounts of gem-quality sodalite/hackmanite—some unusually transparent—have been produced.

The “Miner’s Fantasy Mine” gem pocket replica highlights various gems and minerals mined in San Diego County.

Hidden Gems at the San Diego Natural History Museum

Erica Zaidman, November 11, 2022

Each level of the vertical Hidden Gems exhibit offers a different theme at the San Diego Natural History Museum.

This exhibit features 10 cases demonstrating the importance of the mineral world.

The Year of Mineralogy at the Perot Museum

Erica Zaidman, November 11, 2022

The Perot Museum of Nature and Science promotes public interest in mineral studies with The Year of Mineralogy exhibit.

Evan Smith studies images of diamond inclusions on a computer.

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Postdoctoral Program Gives Scientists Access to Rare Research Opportunities

Amanda J. Luke, November 16, 2016

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

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