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Research Article
Ying Guo
China University of Geosciences (Beijing)
Corresponding Author
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The colour of chrysoprase is produced by Ni cations and influenced by other transition-metal cations and crystallinity. Presented here is a study of the origin of chrysoprase colour and an exploration of the factors that influence it from the perspective of gemstone chromaticity. Transmission electron microscopy and X-ray fluorescence, ultraviolet–visible and Raman spectroscopies are used to investigate 41 gem-quality chrysoprase samples, and the results show that chrysoprase colour results from nanometre-size inclusions of pimelite. Under a 6504-K fluorescent lamp, chrysoprase colour is divided into the grades of fancy, fancy intense and fancy deep. The lightness of chrysoprase is affected mainly by its Cr content, the chroma is affected by its Ni content and the hue angle is affected by the sum of its Cr and Fe contents. Chrysoprase hue and chroma are related significantly to the transmission window that occurs between the two main bands centred at 380 and 660 nm and the absorption peak at 660 nm in the ultraviolet–visible spectrum. Chrysoprase with low crystallinity has more Ni and a higher chroma.
Keywords
chrysoprase, ultraviolet–visible and Raman spectroscopies, gemstone chromaticity
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The full text of this article is available to read as a PDF.
No competing interests reported.
This is a list of supplementary files associated with this preprint. Click to download.
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CURRENT STATUS: Under Review
Version 1
Posted 08 Mar, 2021
No community comments so far
Editorial decision: Major revision
On 08 Apr, 2021
Reviews received
Received 15 Mar, 2021
Reviewers agreed
On 11 Mar, 2021
Reviewers invited
Invitations sent on 11 Mar, 2021
Editor assigned
On 11 Mar, 2021
Editor invited
On 02 Mar, 2021
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On 02 Mar, 2021
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On 22 Feb, 2021
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Subject Areas
Biogeography
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This preprint is under consideration at Scientific Reports. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Ying Guo
China University of Geosciences (Beijing)
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 08 Mar, 2021
No community comments so far
Editorial decision: Major revision
On 08 Apr, 2021
Reviews received
Received 15 Mar, 2021
Reviewers agreed
On 11 Mar, 2021
Reviewers invited
Invitations sent on 11 Mar, 2021
Editor assigned
On 11 Mar, 2021
Editor invited
On 02 Mar, 2021
Submission checks complete
On 02 Mar, 2021
First submitted
On 22 Feb, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Biogeography
License:
This work is licensed under a CC BY 4.0 License. Read Full License
The colour of chrysoprase is produced by Ni cations and influenced by other transition-metal cations and crystallinity. Presented here is a study of the origin of chrysoprase colour and an exploration of the factors that influence it from the perspective of gemstone chromaticity. Transmission electron microscopy and X-ray fluorescence, ultraviolet–visible and Raman spectroscopies are used to investigate 41 gem-quality chrysoprase samples, and the results show that chrysoprase colour results from nanometre-size inclusions of pimelite. Under a 6504-K fluorescent lamp, chrysoprase colour is divided into the grades of fancy, fancy intense and fancy deep. The lightness of chrysoprase is affected mainly by its Cr content, the chroma is affected by its Ni content and the hue angle is affected by the sum of its Cr and Fe contents. Chrysoprase hue and chroma are related significantly to the transmission window that occurs between the two main bands centred at 380 and 660 nm and the absorption peak at 660 nm in the ultraviolet–visible spectrum. Chrysoprase with low crystallinity has more Ni and a higher chroma.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
The full text of this article is available to read as a PDF.
No competing interests reported.
This is a list of supplementary files associated with this preprint. Click to download.
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