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- Title
Atypical Photoluminescence Feature in a Colorless Type IIa.
- Authors
Neal, Jon
- Abstract
The article discusses the presence of atypical photoluminescence feature in E-color, pear-shaped type IIa diamond discovered while conducting a test in a New York laboratory of the Gemological Institute of America (GIA). The defect, which is blamed for the so-called 40 nanometer (nm) band, is said to occur in some type I diamonds. Based on analysis, the 480 nm band is nitrogen-related as it is only detected in type I stones. The author adds that the 480 nm band defect is nickel-related.
- Subjects
NEW York (State); PHOTOLUMINESCENCE; DIAMONDS; NITROGEN; NICKEL; GEMOLOGICAL Institute of America; LABORATORIES
- Publication
Gems & Gemology, 2007, Vol 43, Issue 4, p358
- ISSN
0016-626X
- Publication type
Article