GIA’s laboratories use advanced instrumentation and research to deliver accurate grading, identification, and origin determination for natural and laboratory-grown diamonds, colored stones, and pearls.

Gemology has become a highly technical field employing analytical instruments for gem testing, driven by the need to address increasingly complex identification challenges in the marketplace.

Raman spectroscopy and XRD techniques are used to identify gemstone species through their atomic-scale structures, with Raman spectroscopy analyzing inelastic light scattering from crystal lattice vibrations and XRD examining X-ray interference patterns from atomic layers.

The primary chemical analysis methods applied in gemology are XRF, which uses X-ray emissions for nondestructive testing, and LA-ICP-MS, which provides detailed analysis and greater sensitivity. LA-ICP-MS has become essential for origin determination and treatment detection.

An overview of the Winter 2024 Gems & Gemology content.

Methods, Treatments, and Identification

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

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

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

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

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

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.

An in-depth look at a new pearl simulant gaining popularity in the fashion jewelry market.

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

Examination of polished quartz samples reveals crystal inclusions identified as hedenbergite and sphalerite.

An overview of the Fall 2024 Gems & Gemology content.

Two natural diamonds containing cloud inclusions that resemble stars are examined in the Carlsbad laboratory.

A GIA student from the New York campus receives recognition for a necklace design featuring diamonds, lavender jade, and akoya pearls.

Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007.