Application of Infrared Spectra to Identification of Enhanced Common Gemstones

Jie Luo; Yalan Xu; Huizhen Huang; Jiajun Liu

doi:10.3788/LOP202158.1630003

Journals >Laser & Optoelectronics Progress >Volume 58 >Issue 16 >Page 1630003 > Article

Laser & Optoelectronics Progress
Vol. 58, Issue 16, 1630003 (2021)

Application of Infrared Spectra to Identification of Enhanced Common Gemstones

Jie Luo¹, Yalan Xu^2、*, Huizhen Huang¹, and Jiajun Liu¹

Author Affiliations

¹School of Jewelry, Guangzhou City University of Technology, Guangzhou, Guangdong 510800, China

²School of Jewelry, Arts and Design, Wuzhou University, Wuzhou, Guangxi 543002, China

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DOI: 10.3788/LOP202158.1630003 Cite this Article Set citation alerts

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 Copy Citation Text

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Fig. 1. Common gemstones and their enhancement products

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Fig. 2. Infrared absorption spectra of jadeite, wax-soaked jadeite and colloid-filled jadeite. (a) Reflection method; (b) transmission method

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Fig. 3. Infrared absorption spectra of emerald (slight oil), oil-soaked emerald and colloid-filled emerald. (a) Reflection method; (b) transmission method

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Fig. 4. Infrared absorption spectra of oil-soaked ruby and colloid-filled ruby. (a) Reflection method; (b) transmission method

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Fig. 5. Infrared absorption spectra of moonstone and coated moonstone measured by reflection method

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Fig. 6. Infrared absorption spectra of opal and coated opal measured by reflection method

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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: noneLong wave: none	Fiber interlacing structure
Colloid-filled jadeite	1.66	3.30	Short wave: weak and greenLong wave: strong and green	Fiber interlacing structure and texture caused by acid erosion
Emerald (slight oil)	1.578--1.587	2.73	Short wave: noneLong wave: none	Gas-liquid inclusions
Oil-soaked emerald	1.580--1.588	2.74	Short wave: noneLong wave: none	Gas-liquid inclusions
Colloid-filled emerald	1.582--1.590	2.72	Short wave: weak and greenLong wave: none	Gas-liquid inclusions
Oil-soaked ruby	1.761--1.769	4.01	Short wave: weak and redLong wave: weak and red	Gas-liquid inclusions
Colloid-filled ruby	1.762--1.770	4.03	Short wave: noneLong wave: medium and red	Gas-liquid inclusions with blue flash and bubblet
Moonstone	1.52	2.59	Short wave: weak and pinkLong 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: noneLong 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

Table 1. Conventional gemological parameters of common gemstones and their enhancement products

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

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