A Multicore Non-Bead Cultured Pearl
A non-bead cultured pearl with six cores is discovered in a large lot of pearls submitted to the Mumbai laboratory.
Mineral Assemblage of “Paraíba Matrix”
The contents of two “Paraíba matrix” samples are analyzed.
Interesting Metallic Platelets in Morganite
Skeletal formations of metallic reflective thin films are observed in a pinkish orange morganite.
Helvine Inclusions in Morganite
An orangy pink morganite specimen from Madagascar contains hundreds of yellow helvine crystals aligned on a single plane.
Almandine Garnet from Phu Tho, Vietnam
Reports on the study of garnet samples from a source in northern Vietnam.
Fireworks Display in Russian Emerald
The inclusion scene in a Russian emerald resembles fireworks illuminating a night sky.
Irradiated HPHT-Grown Diamonds with Blue-Green Color Zonation
The Carlsbad laboratory reports on two HPHT-grown diamonds with interesting sector-dependent color zonation.
Zoned Trapiche Emerald with Goshenite Overgrowth
A 12.62 ct trapiche emerald with areas of goshenite is analyzed in GIA’s Tokyo laboratory.
Colored Bands in CVD-Grown Diamond
A CVD-grown diamond submitted to the Surat laboratory exhibits a growth remnant appearing as a colored band.
Arzakite Inclusion in Ruby from Mogok
A report on the first documented arzakite inclusion in a Mogok ruby.
Gemfields Emerald and Ruby Auctions
An inside look at the mid-2024 offerings from the Gemfields emerald and ruby auctions.
The Extraordinary Backstory of Natural Diamonds: A Diamond Is (and Has Been) Forever
Examines new developments in the story of diamond formation and their extraction from the earth.
Gems & Gemology at Ninety: A Look to the Future
An overview of the Fall 2024 Gems & Gemology content.
Observations of Oval-, Pear-, and Marquise-Shaped Diamonds: Implications for Fancy Cut Grading
Presents findings from observations of oval-, pear-, and marquise-shaped diamonds, laying the groundwork for a fancy cut grading system.
Amethyst from Newfoundland, Canada: Geology, Internal Features, and Fluid Inclusion Microthermometry
Characterizes gem-quality amethyst from the La Manche deposit in the Avalon Zone of Newfoundland, Canada.
Generative Artificial Intelligence as a Tool for Jewelry Design
Evaluates the use of generative AI programs in jewelry design and addresses the related ethical, legal, and regulatory challenges.
Splendors from the Deep: Historic Treasures from a Spanish Shipwreck
An in-depth look at jewelry recently recovered from a 1715 Spanish shipwreck.
Classification of Gem Materials Using Machine Learning
Explores the application of several machine learning models to complement traditional gem classification approaches.
