The contents of two “Paraíba matrix” samples are analyzed.

Skeletal formations of metallic reflective thin films are observed in a pinkish orange morganite.

An orangy pink morganite specimen from Madagascar contains hundreds of yellow helvine crystals aligned on a single plane.

The inclusion scene in a Russian emerald resembles fireworks illuminating a night sky.

Reports on the study of garnet samples from a source in northern Vietnam.

A 12.62 ct trapiche emerald with areas of goshenite is analyzed in GIA’s Tokyo laboratory.

The Carlsbad laboratory reports on two HPHT-grown diamonds with interesting sector-dependent color zonation.

A CVD-grown diamond submitted to the Surat laboratory exhibits a growth remnant appearing as a colored band.

A report on the first documented arzakite inclusion in a Mogok ruby.

A suite of seven rare haüyne stones are examined in the Carlsbad laboratory.

An inside look at the mid-2024 offerings from the Gemfields emerald and ruby auctions.

Characterizes gem-quality amethyst from the La Manche deposit in the Avalon Zone of Newfoundland, Canada.

Presents findings from observations of oval-, pear-, and marquise-shaped diamonds, laying the groundwork for a fancy cut grading system.

Evaluates the use of generative AI programs in jewelry design and addresses the related ethical, legal, and regulatory challenges.

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

Scenes from 90 Years of Gems & Gemology

Examines new developments in the story of diamond formation and their extraction from the earth.

An overview of the Fall 2024 Gems & Gemology content.

An in-depth look at jewelry recently recovered from a 1715 Spanish shipwreck.

GIA’s Hong Kong and Bangkok laboratories report on imitation pearls with a striking resemblance to natural Melo pearls.