Reports on the study of sapphire samples from a newly discovered source in southern Tanzania.

A large purplish pink pezzottaite with growth banding and tube inclusions is examined in the Carlsbad laboratory.

A non-bead cultured pearl with six cores is discovered in a large lot of pearls submitted to the Mumbai laboratory.

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.

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

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

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

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

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

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

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

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

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

An overview of the Fall 2024 Gems & Gemology content.

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

Scenes from 90 Years of Gems & Gemology

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

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