Fall 2024 G&G Available Now
November 1, 2024
The Fall issue of Gems & Gemology provides a glimpse into the future of gemology, with a paradigm-shifting approach to assessing fancy-shaped diamonds, the use of machine learning algorithms in gem identification, and the application of artificial intelligence in jewelry design. These three feature articles are accompanied by a study of Canadian amethyst and our timely quarterly columns. This issue also sees the return of Diamond Reflections and highlights jewelry recovered from a 1715 Spanish shipwreck.
Observations of Oval-, Pear-, and Marquise-Shaped Diamonds: Implications for Fancy Cut Grading
Dr. Ilene Reinitz and fellow GIA researchers present their work from the last decade collecting detailed observations of oval-, pear-, and marquise-shaped diamonds for face-up appearance and outline appeal. Combining observer feedback with 3D modeling and virtual facet maps to analyze light behavior, the authors lay the foundation for a fancy cut grading system.
Classification of Gem Materials Using Machine Learning
A GIA team led by Dr. Matthew Hardman explores the application of several machine learning models to complement traditional gem classification approaches, effectively determining the provenance of alexandrite and natural saltwater pearls. They also conclude that subtle indicators of post-growth treatment in some CVD-grown diamonds can be detected using machine learning.
Generative Artificial Intelligence as a Tool for Jewelry Design
Michael Magee evaluates the use of generative AI in jewelry design, assessing the five most commonly used AI tools. The article also addresses the related ethical, legal, and regulatory challenges surrounding AI-generated jewelry designs.
Amethyst from Newfoundland, Canada: Geology, Internal Features, and Fluid Inclusion Microthermometry
Joshua William Lloyd Maloney and coauthors share their study of gem-quality amethyst from Newfoundland, Canada. Discovered in 2017, the deposit has since produced mineral specimens and faceted stones ranging from light purple to medium-dark purple.
Lab Notes
GIA’s global laboratory staff present their latest findings in the Lab Notes section, including extremely rare examples of green haüyne, unusual colored banding in a CVD-grown diamond, and a unique multicore non-bead cultured pearl.
Micro-World
The Micro-World section continues to showcase fascinating gemstone inclusions, with interference thin films in emerald resembling a fireworks display, black hematite inclusions in quartz arranged in the shape of a rose, a rare musgravite crystal in green sapphire, and more.
Diamond Reflections
Dr. Evan Smith’s Diamond Reflections column returns in this issue, examining new developments in the story of diamond formation and their extraction from the earth.
Gem News International
GNI contributors provide a variety of reports from all over the world, such as a behind-the-scenes look at Gemfields emerald and ruby auctions in Bangkok, new sapphire production in Tanzania, an interview in New York with master diamond cutter Harvey Lieberman, and GIA’s examination of a diamond art reproduction of Nelson Mandela’s fingerprint.
In the Spotlight
Lastly, we highlight historical jewelry artifacts recently recovered from a 1715 Spanish shipwreck and analyzed in the Carlsbad laboratory.
Erica Zaidman is associate editor of Gems & Gemology at GIA in Carlsbad, California.
