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Figure 11. Double-strand natural saltwater pearl necklace. Photo by Robert Weldon; courtesy of Karmshil Enterprise. Alexandrite exposed to incandescent illumination (left, red) and daylight-equivalent illumination (right, green). Photos by Robert Weldon; courtesy of GIA’s Dr. Edward J. Gübelin collection, no. 33805. Ring containing a CVD-grown diamond. Photo by Johnny Leung.

Classification of Gem Materials Using Machine Learning

Matthew F. Hardman, Artitaya Homkrajae, Sally Eaton-Magaña, Christoper M. Breeding, Aaron C. Palke, and Ziyin Sun, November 1, 2024

Explores the application of several machine learning models to complement traditional gem classification approaches.

Figure 1. The pearl necklace prize, complete with a jewelry box. Photo by Shunsuke Nagai.

Akoya Cultured Pearl Prize in an Arcade-Style Claw Game

Mari Sasaki, Kazuko Saruwatari, Shoko Odake, and Tsutomu Takada, August 2, 2024

Arcade-style games in Japan dispense akoya pearl jewelry as prizes.

Summer 1994 Gem News International

June 1, 1994

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

Summer 1991 Gem News International

June 1, 1991

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

Vietnamese pearl farm employee at Hạ Long Bay

Vietnam: Shell Nuclei, Pearl Hatcheries, and Pearl Farming

Nicholas Sturman, Kwanreun Lawanwong, Nuttapol Kitdee, and Devchand Chodhry, January 22, 2021

Reports on a visit to a shell nucleus manufacturer and two pearl farms in northern Vietnam, which is emerging as a notable producer.

Lot of 40 drop and oval pearls, with the smallest weighing 0.62 ct and measuring 5.17 × 4.16 mm and the largest weighing 2.95 ct and measuring 9.53 × 6.65 mm. Photo by Gaurav Bera.

Challenges in Identifying Drilled Keshi Pearls

Roxane Bhot Jain, Abeer Al-Alawi, Anukul Belanke, and Lubna Sahani, May 3, 2024

GIA’s Mumbai laboratory studies a lot consisting of 40 pearls to aid in distinguishing natural from non-bead cultured pearls.

Two Tridacna species shells with blister pearls.

Partially Hollow Tridacna Blister Pearls with Shells Attached

Nanthaporn Somsa-ard, Areeya Manustrong, and Joyce WingYan Ho, August 7, 2017

Blister pearls attached to shells are seen in both the Bangkok and New York laboratories.

Article

Shenzhen: The Frontier of China’s Gem and Jewelry Industry

Tao Hsu, and Andrew Lucas, January 25, 2016

All jewelry professionals are familiar with the city of Shenzhen, a global jewelry manufacturing center and a leader of China’s fast-growing gem and jewelry industry. Join the GIA team as we tour the city and discover more about its leading jewelry brands.

Press Release

GIA Board of Governors Welcomes Two New Members

At its recent meeting in Carlsbad, California, the Board of Governors of the Gemological Institute of America, Inc. (GIA) announced the addition of two new members, Lisa Bridge, President and CEO of Ben Bridge Jeweler and Dr. Wendy Bohrson, professor of geology at the Colorado School of Mines.

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