Gemmological Identification of Tanzanite Imitation: Coated Topaz

WANG Peilian; YUE Suwei

doi:10.15964/j.cnki.027jgg.2019.02.005

Volume 21 Issue 2

Feb. 2019

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Journal of Gems & Gemmology > 2019 > 21(2): 34-38. > DOI: 10.15964/j.cnki.027jgg.2019.02.005

WANG Peilian, YUE Suwei. Gemmological Identification of Tanzanite Imitation: Coated Topaz[J]. Journal of Gems & Gemmology, 2019, 21(2): 34-38. DOI: 10.15964/j.cnki.027jgg.2019.02.005

Citation:

WANG Peilian, YUE Suwei. Gemmological Identification of Tanzanite Imitation: Coated Topaz[J]. Journal of Gems & Gemmology, 2019, 21(2): 34-38. DOI: 10.15964/j.cnki.027jgg.2019.02.005

Citation:

WANG Peilian, YUE Suwei. Gemmological Identification of Tanzanite Imitation: Coated Topaz[J]. Journal of Gems & Gemmology, 2019, 21(2): 34-38. DOI: 10.15964/j.cnki.027jgg.2019.02.005

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Gemmological Identification of Tanzanite Imitation: Coated Topaz

WANG Peilian¹,
YUE Suwei^{1, 2, ,}

1.
Shool of Jewelry, Guangzhou College South China University of Technology, Guangzhou 510800, China
2.
Institute of Jewelry, Guangzhou College of South China University of Technology, Guangzhou 510800, China

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Received Date: May 15, 2018

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Abstract

Abstract

In March 2018, two "tanzanites" were bought at a low price from Shuibei jewelry market in Shenzhen. The samples were found to be coated topaz through the conventional detection. Then a series of tests were proceeded, such as infrared spectroscopy, X-ray fluorescence spectrometer, UV-Vis spectra and so on. One of the samples was poliched and a colorless topaz was came to light, which proved that the bottom of the sample was coated by colored materials. Chemical analysis suggested that the main material of the coated layer contained titanium and the content ranges from 2.769% to 5.039%.UV-Vis spectra test showed 326, 531 nm absorption peak. The purpose of coated topaz was to change its colour to simulate tanzanite.
- coated topaz,
- tanzanite imitation,
- containing titanium material

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References (8)

References

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