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Thermochromic and photochromic behaviour of "chameleon" diamonds

Fritsch, E. and Massi, L. and Rossman, G. R. and Hainschwang, T. and Jobic, S. and Dessapt, R. (2007) Thermochromic and photochromic behaviour of "chameleon" diamonds. Diamond and Related Materials, 16 (2). pp. 401-408. ISSN 0925-9635.

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Chameleon diamonds typically change color from greyish-green to yellow when they are heated or cooled (thermochromic behaviour) or kept in the dark (photochromic behaviour). Those diamonds are type Ia with A aggregates largely dominating the nitrogen speciation. They contain moderate to high amounts of hydrogen, in addition to some isolated nitrogen and traces of nickel. Their UV Visible spectrum comprises the continuum typical of type Ib material, the 480 nm band and a broad band centred around 800 nm. It is mainly modified in the red part of the visible spectrum when the color change occurs. We here propose an electronic model consistent with all observed color behaviours, based on the premise that yellow is the stable color whereas green is the metastable one. The chameleon effect is possibly linked to a nitrogen–hydrogen complex.

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Rossman, G. R.0000-0002-4571-6884
Additional Information:© 2006 Elsevier B.V. Received 9 November 2005; received in revised form 19 July 2006; accepted 21 August 2006. Available online 4 October 2006. The authors wish to thank the many private parties who loaned chameleon diamonds. Much of the early stages of this work were conducted at the Gemological Institute of America at the time in Santa Monica, CA, with the support of Dr. James E. Shigley and Mr. Thomas Moses and several other colleagues. The SanaDiam Company, Antwerp, Belgium, loaned us a chameleon rough. We want to thank also Chris Ewels for useful discussions, and two anonymous reviewers for constructive comments.
Subject Keywords:natural diamond; chameleon effect; hydrogen; optical properties
Issue or Number:2
Record Number:CaltechAUTHORS:20130429-102327075
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Official Citation:E. Fritsch, L. Massi, G.R. Rossman, T. Hainschwang, S. Jobic, R. Dessapt, Thermochromic and photochromic behaviour of “chameleon” diamonds, Diamond and Related Materials, Volume 16, Issue 2, February 2007, Pages 401-408, ISSN 0925-9635, 10.1016/j.diamond.2006.08.014.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38152
Deposited By: Tony Diaz
Deposited On:07 May 2013 19:24
Last Modified:03 Oct 2019 04:54

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