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GEMSTONES
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
These are the first sections to be uploaded and additional gems will be
inserted in them as we proceed
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Diffraction Spectra
of
Diamond
Cape series Type 1a
Colour Properties
of Diamond Cape Series Type 1a
|
Colour |
Almost colourless to pale yellow |
|
Cause of colour |
Nitrogen colour centre |
|
Optical Character |
Isotropic |
|
Pleochroism |
Not applicable |
|
Colour change |
Not applicable |
|
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. |
|
Ordinary ray |
Not applicable |
|
Extraordinary ray |
Not applicable |
|
Alpha ray |
Not applicable |
|
Beta ray |
Not applicable |
|
Gamma ray |
Not applicable |
|
Emission lines |
No |
|
Database reference |
CS1 |
|
Notes |
|
Copyright John S.
Harris
2000-2010 |
SPECTRA OF PRINCIPAL
COMMERCIAL GEMSTONES
ALEXANDRITE
ALMANDINE
GARNET
CHRYSOBERYL
EMERALD
GREEN JADEITE
PERIDOT
RUBY
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
|
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Gemmological Research and Education