Optical properties of some greenish blue-to-green diamonds

James E. Shigley; Emmanuel Fritsch

doi:10.1117/12.22470

1 December 1990 Optical properties of some greenish blue-to-green diamonds

James E. Shigley, Emmanuel Fritsch

Proceedings Volume 1325, Diamond Optics III; (1990) https://doi.org/10.1117/12.22470
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

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.

Citation Download Citation

James E. Shigley and Emmanuel Fritsch "Optical properties of some greenish blue-to-green diamonds", Proc. SPIE 1325, Diamond Optics III, (1 December 1990); https://doi.org/10.1117/12.22470

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