Laser & Optoelectronics Progress, Volume. 58, Issue 16, 1630003(2021)
Application of Infrared Spectra to Identification of Enhanced Common Gemstones
Figures & Tables(7)
Fig. 2. Infrared absorption spectra of jadeite, wax-soaked jadeite and colloid-filled jadeite. (a) Reflection method; (b) transmission method
Fig. 3. Infrared absorption spectra of emerald (slight oil), oil-soaked emerald and colloid-filled emerald. (a) Reflection method; (b) transmission method
Fig. 4. Infrared absorption spectra of oil-soaked ruby and colloid-filled ruby. (a) Reflection method; (b) transmission method
Fig. 5. Infrared absorption spectra of moonstone and coated moonstone measured by reflection method
Fig. 6. Infrared absorption spectra of opal and coated opal measured by reflection method
Table 1. Conventional gemological parameters of common gemstones and their enhancement products
View tableTable 1. Conventional gemological parameters of common gemstones and their enhancement products
Sample Refractive index Relative density Fluorescence in ultraviolet fluorescent lamps Internal characteristic Jadeite(slight wax) 1.66 3.33 Short wave: none Long wave: none Fiber interlacing structure Wax-soaked jadeite 1.66 3.32 Short wave: none Long wave: none Fiber interlacing structure Colloid-filled jadeite 1.66 3.30 Short wave: weak and green Long wave: strong and green Fiber interlacing structure and texture caused by acid erosion Emerald (slight oil) 1.578--1.587 2.73 Short wave: none Long wave: none Gas-liquid inclusions Oil-soaked emerald 1.580--1.588 2.74 Short wave: none Long wave: none Gas-liquid inclusions Colloid-filled emerald 1.582--1.590 2.72 Short wave: weak and green Long wave: none Gas-liquid inclusions Oil-soaked ruby 1.761--1.769 4.01 Short wave: weak and red Long wave: weak and red Gas-liquid inclusions Colloid-filled ruby 1.762--1.770 4.03 Short wave: none Long wave: medium and red Gas-liquid inclusions with blue flash and bubblet Moonstone 1.52 2.59 Short wave: weak and pink Long wave: none Being internally flawless with moonlight effect Coated moonstone 1.52 2.58 Short wave: weak and pink Long wave: medium and pink Having some cracks and being partly weak lustre with moonlight effect Opal 1.45 2.15 Short wave: none Long wave: none Play of colour and being internally flawless Coated opal 1.45 2.13 Short wave: none Long wave: medium, blue and white Play of colour, being internally flawless, and being partly weak lustre
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Jie Luo, Yalan Xu, Huizhen Huang, Jiajun Liu. Application of Infrared Spectra to Identification of Enhanced Common Gemstones[J]. Laser & Optoelectronics Progress, 2021, 58(16): 1630003
Paper Information
Category: Spectroscopy
Received: Oct. 27, 2020
Accepted: Dec. 27, 2020
Published Online: Aug. 20, 2021
The Author Email: Yalan Xu (422563014@qq.com)
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