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The "amber centres" and their relation to the brown colour in diamond

Research output: Contribution to journalArticle

L Massi, E Fritsch, A T Collins, T Hainschwang, F Notari

Original languageEnglish
Pages (from-to)1623 - 1629
Number of pages7
Issue number10
Publication statusPublished - Oct 2005

King's Authors

Research Groups

  • Physics


The amber centres are a series of similar near-infrared absorptions found in brown "amber"-coloured diamonds. These centres are found exclusively in crystals showing lamellae of plastic deformation ("brown graining") and nitrogen in the form of A-aggregates, at least. They represent likely electronic transitions responsible for up to six zero-phonon lines and associated vibronic structures. Four different categories may be distinguished. The most common one is proposed to be caused by a "defective" A-aggregate. (c) 2005 Elsevier B.V. All rights reserved

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