A contribution to the understanding of pink color in diamond: The unique, historical

Research areas:

• Surfaces planétaires (2011 - 2016)

Year:

2007

Authors:

• Emmanuel Fritsch
• Benjamin Rondeau
• Thomas Hainschwang
• Marie-Helene Quellier

Journal:

DIAMOND AND RELATED MATERIALS

Volume:

16

Number:

8

Pages:

1471-1474

Month:

August

ISSN:

0925-9635

BibTex:

@article{WOS:000247804900004, author = "Emmanuel Fritsch and Benjamin Rondeau and Thomas Hainschwang and Marie-Helene Quellier", abstract = "We recorded properties of a historical 9.01 ct pink diamond, the Grand Conde. It is a type IIa diamond that shows very weak absorptions at 860, 960, 1050, 1115 and 1156 cm(-1) that had not been reported yet. It shows an homogeneous fancy pink coloration with a subtle orangey component, and no discernable colored graining. However, we recorded an absorption band at 550 mu (2.2 eV), usually typical of pink diamonds with colored graining due to plastic deformation: this is the first time that these two properties are reported together for a single diamond. This shows that there is no direct connection between pink graining and the absorption at 2.2 eV. Second, we recorded a series of sharp absorptions at 573, 586, 594,600 and 609 nm. We name it the 609 nm system. This system, probably related to the pink coloration, had only once been partially documented before, in three dark pink to red-brown diamonds. The 609 nm system is not related to the intensity of the pink coloration. Although this system might be vibronic in nature, it does not show the typical pattern for a simple vibronic structure. (c) 2006 Elsevier B.V. All rights reserved.", doi = "10.1016/j.diamond.2006.12.006", extra = "PICL", issn = "0925-9635", journal = "DIAMOND AND RELATED MATERIALS", month = "AUG", number = "8", pages = "1471-1474", title = "{A} contribution to the understanding of pink color in diamond: {T}he unique, historical ", volume = "16", year = "2007", }

Abstract:

We recorded properties of a historical 9.01 ct pink diamond, the Grand
Conde. It is a type IIa diamond that shows very weak absorptions at 860,
960, 1050, 1115 and 1156 cm(-1) that had not been reported yet. It shows
an homogeneous fancy pink coloration with a subtle orangey component,
and no discernable colored graining. However, we recorded an absorption
band at 550 mu (2.2 eV), usually typical of pink diamonds with colored
graining due to plastic deformation: this is the first time that these
two properties are reported together for a single diamond. This shows
that there is no direct connection between pink graining and the
absorption at 2.2 eV.
Second, we recorded a series of sharp absorptions at 573, 586, 594,600
and 609 nm. We name it the 609 nm system. This system, probably related
to the pink coloration, had only once been partially documented before,
in three dark pink to red-brown diamonds. The 609 nm system is not
related to the intensity of the pink coloration. Although this system
might be vibronic in nature, it does not show the typical pattern for a
simple vibronic structure. (c) 2006 Elsevier B.V. All rights reserved.