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Proceedings Paper

Optical properties of some greenish blue-to-green diamonds
Author(s): James E. Shigley; Emmanuel Fritsch
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Paper Abstract

Most green diamonds owe their coloration to radiation exposure that produces the GR]. absorption band. Depending upon the conditions of radiation either a surface color or a bodycolor can result. Natural green diamonds of known geographic origin especially those with a conspicuous bodycolor are extremely rare. A group of seven natural greenish bluetogreen bodycolor type-Ia diamonds from alluvial deposits in Guyana display a distinct but sometimes subtle internal blue-to-green color zoning and a visiblerange absorption spectrum consisting of in addition to the N3 N2 and GR1 bands weak-to-moderate 503 (H3) 496 (H4) and 595 nm bands. We suggest that this combination of features is characteristic of at least one category of natural bodycolor green diamonds. 1.

Paper Details

Date Published: 1 December 1990
PDF: 10 pages
Proc. SPIE 1325, Diamond Optics III, (1 December 1990); doi: 10.1117/12.22470
Show Author Affiliations
James E. Shigley, Gemological Institute of America (United States)
Emmanuel Fritsch, Gemological Institute of America (United States)

Published in SPIE Proceedings Vol. 1325:
Diamond Optics III
Albert Feldman; Sandor Holly, Editor(s)

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