the quarterly journal of the gemological institute of america
In This Issue
- Application of UV-Vis-NIR Spectroscopy to Gemology
- Infrared Spectroscopy and Its Use in Gemology
- An Exploration of Photoluminescence Spectroscopy
- Raman Spectroscopy
and X-Ray Diffraction - Chemical Analysis in the Gemological Laboratory
- Fluorescence and Phosphorescence of Diamonds, Colored Stones, and Pearls
- Applications of X-Ray Radiography and X-Ray Computed Microtomography
- Metrology at GIA
Previous IssueWinter 2024 - Volume 60, Issue 4
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the quarterly journal of the gemological institute of america
Analytical Techniques in Gemology: A Historical Overview
James E. Shigley
A look at the history of analytical instruments used for gem testing.
Articles (9)
Application of UV-Vis-NIR Spectroscopy to Gemology
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.
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Infrared Spectroscopy and Its Use in Gemology
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.
Read MoreShining a Light on Gemstone Properties: An Exploration of Photoluminescence Spectroscopy
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.
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Raman Spectroscopy and X-Ray Diffraction: Phase Identification of Gem Minerals and Other Species
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.
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Chemical Analysis in the Gemological Laboratory: XRF and LA-ICP-MS
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.
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Glowing Gems: Fluorescence and Phosphorescence of Diamonds, Colored Stones, and Pearls
Photoluminescence imaging, which analyzes how gemstones glow under ultraviolet light, is an important analytical tool for detecting impurities, natural versus synthetic gems, and treatments through the observation of fluorescence and phosphorescence patterns.
Read More
Applications of X-Ray Radiography and X-Ray Computed Microtomography in Gemology
X-ray imaging techniques revolutionized pearl testing by enabling gemologists to distinguish natural from cultured pearls through detailed visualization of their internal structures, evolving from film-based systems in the early 1900s to today’s sophisticated digital equipment.
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Metrology at GIA
GIA ensures accurate gemological measurements across its global laboratories through rigorous metrology practices, including systematic instrument calibration, validation from traceable standards, and continuous monitoring by trained staff to maintain precision and consistency.
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Analysis of Gemstones at GIA Laboratories
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.
Read MoreIn Memoriam
The life of renowned Scottish gemologist Alan Hodgkinson is remembered.
The gemological community mourns the loss of the legendary gemstone cutter and carver, Glenn Lehrer.
Most Valuable Article Awards
Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
John L. Emmett, Ungkhana Atikarnsakul, Jennifer Stone-Sundberg, and Supharart Sangsawong
Gemological Characterization of Montana Sapphire from the Secondary Deposits at Rock Creek, Missouri River, and Dry Cottonwood Creek
Aaron C. Palke, Nathan D. Renfro, Jeffrey R. Hapeman, and Richard B. Berg
Color Modification of Spinel by Nickel Diffusion: A New Treatment
Michael Jollands, Abadie Ludlam, Aaron C. Palke, Wim Vertriest, Shiyun Jin, Pamela Cevallos, Sarah Arden, Elina Myagkaya, Ulrika D’Haenens-Johannson, Vararut Weeramongkhonlert, and Ziyin Sun
Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning
Shiyun Jin, Aaron C. Palke, Nathan D. Renfro, and Ziyin Sun
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