Spectroscopic evidence of GE POL HPHT-treated natural type IIa diamonds

63Citations
Citations of this article
23Readers
Mendeley users who have this article in their library.

Abstract

Results from spectroscopic analyses of GE POL high-pressure high-temperature (HPHT) annealed nominally type IIa diamonds are presented, and these spectral characteristics are compared with those of untreated diamonds of similar appearance and type. Absorption spectroscopy reveals that any yellow coloration in such HPHT-treated diamonds is due to low concentrations of single nitrogen, which have not been observed in untreated type IIa diamonds. Laser-excited photoluminescence spectroscopy reveals the presence of nitrogen-vacancy centers in most, but not all, HPHT-treated stones. When these centers are present, the ratio of the 575:637 nm luminescence intensities offers a potential means of separating HPHT-treated from untreated type IIa diamonds. The total absence of luminescence may be another important indicator of HPHT treatment. © 2000 Gemological Institute of America.

References Powered by Scopus

Infrared absorption by the single nitrogen and a defect centres in diamond

208Citations
N/AReaders
Get full text

Change of absorption spectra in type-Ib diamond with heavy neutron irradiation

198Citations
N/AReaders
Get full text

Optical absorption features associated with paramagnetic nitrogen in diamond

162Citations
N/AReaders
Get full text

Cited by Powered by Scopus

Identification of synthetic diamond grown using Chemical Vapor Deposition (CVD)

153Citations
N/AReaders
Get full text

The "type" classification system of diamonds and its importance in gemology

131Citations
N/AReaders
Get full text

The Fermi level in diamond

131Citations
N/AReaders
Get full text

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Cite

CITATION STYLE

APA

Fisher, D., & Spits, R. A. (2000). Spectroscopic evidence of GE POL HPHT-treated natural type IIa diamonds. Gems and Gemology, 36(1), 42–49. https://doi.org/10.5741/GEMS.36.1.42

Readers over time

‘12‘13‘14‘16‘18‘19‘20‘21‘22‘23‘2402468

Readers' Seniority

Tooltip

PhD / Post grad / Masters / Doc 7

50%

Researcher 4

29%

Professor / Associate Prof. 3

21%

Readers' Discipline

Tooltip

Physics and Astronomy 6

46%

Earth and Planetary Sciences 5

38%

Materials Science 1

8%

Engineering 1

8%

Save time finding and organizing research with Mendeley

Sign up for free
0