General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 42645-2023
Introduction
GB/T 42645-2023 "Jewelry and Gemstone Identification - Ultraviolet-Visible Absorption Spectroscopy" is a national standard of China that provides guidelines for the identification of jewelry and gemstones using ultraviolet-visible absorption spectroscopy.
This standard outlines the principles, equipment, and procedures for conducting UV-Vis absorption spectroscopy analysis on gemstones and jewelry. It covers the selection of appropriate wavelengths, sample preparation techniques, and interpretation of absorption spectra to determine the authenticity and quality of gemstones.
UV-Vis absorption spectroscopy is a non-destructive analytical technique widely used in gemstone identification. It involves exposing a gemstone to ultraviolet and visible light and measuring the intensity of light absorbed by the sample. This technique allows gemologists to identify the presence of certain elements or impurities that can affect the color and overall quality of gemstones.
The standard also provides guidance on the calibration and maintenance of UV-Vis absorption spectroscopy equipment to ensure accurate and reliable results. It emphasizes the importance of following standardized procedures and recording all relevant data during the analysis process.
By following the guidelines outlined in GB/T 42645-2023, gemologists and jewelry professionals can effectively use UV-Vis absorption spectroscopy to authenticate gemstones, detect treatments or enhancements, and assess their quality. This standard contributes to the overall quality assurance and consumer confidence in the jewelry and gemstone industry.
GB/T 42645-2023 history
2023GB/T 42645-2023 Jewelry and Jade Identification by Ultraviolet-visible Absorption Spectroscopy