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Figure 1. These indicolite tourmalines (9.27 and 6.16 ct) from Zambia are among the variety of gems Virtu Gem offers. Photo by Robert Weldon.

More on Virtu Gem’s Ethical Supply Chain Practices

Erin Hogarth, January 26, 2024

An update on Virtu Gem’s mission to improve artisanal mining and gem trading practices in Kenya, Malawi, and Zambia.

Figure 1. Lidded goblet from the collection of the Bavarian National Museum in Munich, embellished with red Bohemian garnets. Inventory no. 60/74, height 17.7 cm. Photo by Bastian Krack; courtesy of Bavarian National Museum in Munich.

Bohemian Garnets as Decorative Materials for Glass Vessels from the Late Sixteenth to Early Eighteenth Centuries

Karl Schmetzer, Hans Albert Gilg, and Hans-Jörg Ranz, January 26, 2024

Examines a technique for setting cut garnets on glass objects, invented by Claudius vom Creutz of Nuremberg in the late sixteenth century.

Figure 1. This 2.20 ct Fancy Deep brownish orange treated HPHT-grown diamond owes its distinctive appearance to multiple defect concentrations created within the various growth sectors. Photo by Diego Sanchez.

Treated HPHT Laboratory-Grown Diamond with Dramatic Color Zoning

Sally Eaton-Magaña and Taryn Linzmeyer, January 26, 2024

A Fancy Deep brownish orange treated HPHT-grown diamond exhibits multiple defect concentrations in various growth sectors.

Figure 2. The cut and polished piece of pyritized triceratops fossil on the left weighs 50.5 ct and measures 41.28 × 22.23 mm. The piece on the right weighs 22.5 ct and measures 31.75 × 15.88 mm. Photos by SD Gem & Fossil.

Pyritized Triceratops Fossils from South Dakota

Deven Fisher, January 26, 2024

A newfound dinosaur site in the Hell Creek Formation of South Dakota leads to the discovery of pyritized triceratops fossils.

Figure 1. A look inside Adamas Jewelers in San Dimas, California, operated by Chi Huynh and his brother Kiet. The store carries Galatea’s jewelry and is decorated with Huynh’s wood carvings and paintings, including the boat-style showcases inspired by the family’s journey from Vietnam. Photo by Tao Hsu.

Never Stop Innovating: Gem Artist Chi Huynh

Tao Hsu, Artitaya Homkrajae, and Kevin Schumacher, January 25, 2023

Profiles a groundbreaking gem artist on a quest to bring new concepts, techniques, and products to the industry.

Novelty Cut Diamond Faceted as Iconic Apple Logo

Maryam Mastery Salimi and Najmeh Anjomani, January 28, 2022

A novelty cut Fancy yellow diamond submitted to the Carlsbad laboratory bears a striking resemblance to the iconic Apple Inc. logo.

Namak Mandi: A Pioneering Gemstone Market in Pakistan

Habib Ur Rehman, Bilal, Syed Owais, Obaid Ur Rahman, and Andy H. Shen, September 3, 2021

Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.

Review of The Secret Teachings of Gemcutting: 50 Classic Gemstone Designs, by Justin K. Prim.

Book Review: The Secret Teachings of Gemcutting: 50 Classic Gemstone Designs

Nathan Renfro, November 24, 2021

Review of The Secret Teachings of Gemcutting: 50 Classic Gemstone Designs, by Justin K. Prim.

Monstrance from the Treasury of Cologne Cathedral

Baroque-Era Rose Cuts of Colored Stones: Highlights from the Second Half of the Seventeenth Century

Karl Schmetzer, April 5, 2021

Offers a systematic evaluation of rose cuts produced for various colored stones in the latter seventeenth century, based on the examination of rare artifacts that belonged to the archbishops and prince-electors of Trier and Cologne.

A notebook, pen, mobile phone with compass app and a digital camera sit on top of a map.

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The Stories Behind the Photos: A Gigantic Aquamarine and ‘Gaudy’ Nature

Amanda J. Luke, July 28, 2020

Gemological photojournalist Robert Weldon shares the stories behind some of his favorite photos.

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