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GEMSTONE
SPECTRA
(EXCEL FILES)
COLOURLESS
STONES
CS1
RED STONES
RD1
Dark red
RD2 Pinkish red
RD3
Orangy red
RD4 Slightly purplish red
RD5 Purplish red
PINK STONES
PK1 Lilac pink
PK2 Pink and orangy pink
PK3
Brownish and purplish pink
ORANGE
STONES
OR1
YELLOW STONES
YL1
GREEN STONES
GN1
Green
GN2 Yellowish and greyish green
GN3 Bluish green
GN4 Dark and brownish green
BROWN STONES
BN1 Light brown
BN2 Dark brown
BLUE STONES
BL1 Blue
BL2 Greenish blue
BL3 Lavender and indigo blue
VIOLET AND PURPLE
STONES
VT - PL Violet and Purple
Periodically
other gemstones will be added to these files
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Diffraction spectra of diamond - cape series
type 1a
See my DECLARATION OF COPYRIGHT
Colour Properties
of Diamond Cape Series Type 1a
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Colour |
Almost colourless to pale yellow |
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Cause of colour |
Nitrogen colour centre |
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Optical Character |
Isotropic |
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Pleochroism |
Not applicable |
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Colour change |
Not applicable |
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Spectrum; no polar, calibration in nm. |
The diagnostic line at 415 strengthens with intensity of colour.
Other faint lines in this system appear in deeper coloured stones
,at 423;435;451;465 and a stronger one at 478. |
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Ordinary ray |
Not applicable |
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Extraordinary ray |
Not applicable |
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Alpha ray |
Not applicable |
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Beta ray |
Not applicable |
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Gamma ray |
Not applicable |
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Emission lines |
No |
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Database reference |
CS1; BL2 and BN1 |
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Notes |
A suitable blue filter will help to detect the line at 415nm. |
Spectrograph of diamond CSF0684
Copyright John S.
Harris - from the year 2000
to the current date.
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SPECTRA OF
PRINCIPAL
COMMERCIAL GEMS
ALEXANDRITE
ALMANDINE
GARNET
CHRYSOBERYL
EMERALD
GREEN JADEITE
PERIDOT
RUBY
BLUE SAPPHIRE
RED
SPINEL
GREEN & BLUE SPINEL
SYN.
BLUE SPINEL & Co. GLASS
SYN. COLOUR
CHANGE CORUNDUM
ZIRCON (High type)
ZIRCON (Low type)
Other pages are under construction
COLOUR
FILTERS
(EXCEL
FILES)
CF1 Basic Colour Filters
CF2 Special Colour Filters
EDUCATIONAL C. D.
A
GUIDE TO THE SPECTROSCOPE
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Gemlab.UK
Gemmological