Discrimination of HPHT-treated Type Ⅰa Cape Diamonds Using Optical and Photoluminescence Spectroscopic Techniques

SONG Zhong-hua; LU Tai-jin; TANG Shi; GAO Bo; SU Jun; KE Jie

doi:10.15898/j.cnki.11-2131/td.201905200067

Rock and Mineral Analysis > 2020 > 39(1): 85-91. > DOI: 10.15898/j.cnki.11-2131/td.201905200067

SONG Zhong-hua, LU Tai-jin, TANG Shi, GAO Bo, SU Jun, KE Jie. Discrimination of HPHT-treated Type Ⅰa Cape Diamonds Using Optical and Photoluminescence Spectroscopic Techniques[J]. Rock and Mineral Analysis, 2020, 39(1): 85-91. DOI: 10.15898/j.cnki.11-2131/td.201905200067

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Discrimination of HPHT-treated Type Ⅰa Cape Diamonds Using Optical and Photoluminescence Spectroscopic Techniques

1.
National Gemstone Testing Center, Shenyang 110013, China
2.
National Gemstone Testing Center, Beijing 100013, China

More Information

Received Date: December 18, 2018
Revised Date: June 30, 2019
Accepted Date: July 15, 2019
Published Date: December 31, 2019

Abstract

HIGHLIGHTS
(1) The variation characteristics of Cape brown diamonds during HPHT treatment were revealed.

(2) Strong evidence for the identification of Cape-type diamonds treated with high temperature and high pressure was provided.

(3) The conversion of defects (nitrogen, hydrogen) in diamonds is related to diamond type and temperature.

ABSTRACT

BACKGROUNDSpectroscopic characteristics for brown colored Type Ⅱa diamonds treated by high pressure high temperature (HPHT) processes have been investigated extensively. However, almost no reports are available on the variation of the spectroscopic features for the type Ⅰa Cape series brown colored diamonds treated by HPHT processes.
OBJECTIVESTo help the laboratory to resolve the origin of yellow diamonds.
METHODSThe ultraviolet-visible (UV-Vis) absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), and photoluminescence spectroscopy were used to analyze the spectral features for the samples before and after each treatment.
RESULTSThe color of the diamonds changed from grayish brown to brownish yellow after the HPHT process. Meanwhile, the FTIR/UV-Vis absorption, as well as the photoluminescence was also greatly changed. Besides the 415nm and the 477nm absorption peaks, the treated diamonds also display H3 defect (503.2nm) and the gradually increasing absorption from 550nm to shortwave, resulted in the color changing from grayish brown to brownish yellow. In the mid-infrared region, the three peaks of 1498, 1520 and 1547cm^-1 become a broad band centered at 1498cm^-1 after treatment, and the photoluminescence spectrum displayed two distinct defects-H3 (503.2nm) and H2 (986.2nm).
CONCLUSIONSThe spectroscopic features provide a basis for accurate identification of HPHT-treated type Ⅰa Cape series brown diamonds in gem laboratories, and increase understanding of the variation mechanism of the nitrogen and hydrogen related lattice defects in the diamonds during the HPHT processes.

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Discrimination of HPHT-treated Type Ⅰa Cape Diamonds Using Optical and Photoluminescence Spectroscopic Techniques

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