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.

Photoluminescence spectroscopy examines how gemstones absorb and emit light, uncovering crucial details about their identity and color origin through the detection of microscopic defects and impurities.

Infrared spectroscopy, specifically FTIR analysis, measures atomic vibrations to determine identity, cause of color, and potential treatments by analyzing how a gemstone absorbs infrared light.

UV-Vis-NIR spectroscopy measures how gemstones absorb and interact with light across the ultraviolet, visible, and near-infrared ranges, revealing crucial information about their composition, origin, and potential treatments.

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.

An overview of the Winter 2024 Gems & Gemology content.

GIA field gemologists recently completed their one-hundredth expedition, adding to the Institute’s unrivaled store of independently verified gemological information from colored stone mining locales around the world.

Registration for Converge, the singular gem and jewelry event combining the unique expertise of the American Gem Society (AGS) and the Gemological Institute of America (GIA), is now open.

GIA has announced the planned retirement of its president and CEO, Susan Jacques, at the end of 2025. The Institute has begun a global search for a successor.

鑑於業界日漸關注祖母绿填充物的資訊，GIA 將由 12 月 15 日開始在其祖母綠報告中加入填充物鑑定服務。此填充物鑑定服務為自選項目，服務新推出期間將免費提供。

Methods, Treatments, and Identification

Learn about the geology and inclusions of tourmaline from the experts at GIA.

At its recent meeting in Carlsbad, California, the Board of Governors of the Gemological Institute of America, Inc. (GIA) announced the addition of two new members, Lisa Bridge, President and CEO of Ben Bridge Jeweler and Dr. Wendy Bohrson, professor of geology at the Colorado School of Mines.

The GIA laboratory in Ramat Gan, Israel, will end operations by the end of 2024 due to changes in the global diamond industry that resulted in significant declines in submissions from local clients over the last several years.

The GIA laboratory in Ramat Gan, Israel, will end operations by the end of 2024 due to changes in the global diamond industry that resulted in significant declines in submissions from local clients over the last several years.

A surface-reaching crystal in a green sapphire is identified as musgravite.

Examination of rock crystal quartz spheres reveals rose-like hematite inclusions.

A unique art piece crafted with more than 9,200 diamonds is examined at GIA’s Carlsbad laboratory.

An unusual area of granular texture lining the cavity of a ruby indicates synthetic overgrowth.