|
INVESTIGATIONS
|
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
Colour |
Locality |
Info |
nx min |
nx max |
ny min |
ny max |
nz min |
nz max |
Spectrum |
UVS |
UVL |
Reference |
|
Diaspore |
1.699 |
1.749 |
0.049 |
0.05 |
3.39 |
3.4 |
pink |
Afghanistan |
2.05ct to 46.97ct |
1.699 |
1.700 |
1.720 |
1.721 |
1.748 |
1.749 |
|
weak chalky yellowish green |
inert |
The Journal of Gemmology 2020 Vol 37(3), p 240-242 |
|
Diaspore |
1.7 |
1.75 |
0.049 |
0.049 |
3.4 |
3.4 |
brownish green (daylight), brownish pink in incandescent light, very
distinct colour change |
Turkey |
3.38-16.44ct |
1.700 |
1.701 |
1.723 |
1.726 |
1.749 |
1.750 |
broad line at 450nm |
weak yellow |
inert |
Gems & Gemology 1994 winter, p273 |
|
Diaspore |
1.7 |
1.71 |
|
|
3.52 |
3.52 |
pinkish |
|
contents Cr, spot reading |
|
|
|
|
|
|
Cr |
yellow-green |
inert |
http://www.geminterest.com 2007 |
|
Diaspore |
1.7 |
1.749 |
0.049 |
0.049 |
3.39 |
3.39 |
yellowish green, colour change pink |
|
8.39ct |
|
|
|
|
|
|
bands in the blue |
inert |
inert |
ACAM Lab
1057 |
|
Diaspore |
1.7 |
1.749 |
0.049 |
0.049 |
3.38 |
3.38 |
purplish pink |
Afghanistan |
7 stones 0.57ct to 1.60ct |
1.700 |
1.700 |
1.721 |
1.721 |
1.749 |
1.749 |
|
chalky yellow |
very weak red |
Gems & Gemology 2020 Summer p298 |
|
Diaspore |
1.702 |
1.755 |
0.048 |
0.048 |
3.4 |
3.4 |
moderate colour change: light greenish yellow (daylight) to light pinkish
yellow |
Turkey |
|
1.702 |
1.702 |
1.722 |
1.722 |
1.755 |
1.755 |
weak band 450-460 |
|
|
Gems & Gemology 1987 Spring, p44 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.5 |
colour changing olive-green to brownish-purplish pink |
Milas Region,Turkey |
5.7 ct, chelsea: bright pink |
|
|
|
|
|
|
|
|
|
The Australian Gemmologist 2009 Vol23,
N°12, p559-566 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.382 |
3.415 |
colour change: brownish-green to pinkish brown |
|
38.16ct, 12.55ct, 8.89 ct, 4.32ct, 1.87ct, 1.18ct |
1.702 |
1.702 |
1.723 |
1.723 |
1.750 |
1.750 |
strong band 440-468 |
moderate green |
|
The Journal of Gemmology 1987 Vol 20, N°6, p356-358 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.4 |
3.4 |
orangy yellow |
Mugla Province, Turkey |
13.18ct |
|
|
|
|
|
|
broad absorption below 420nm, lines at 455, 463, 475nm |
inert |
inert |
GIA Gem Database 37378 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.35 |
3.35 |
moderate |
|
1.24 ct |
1.702 |
1.702 |
1.722 |
1.722 |
1.750 |
1.750 |
weak band 450-460 nm |
|
|
Gems & Gemology 1983 Fall, p172-173 |
|
Diaspore |
1.703 |
1.75 |
0.047 |
0.047 |
3.39 |
3.39 |
yellowish green |
|
1.33ct |
1.703 |
1.703 |
1.725 |
1.725 |
1.750 |
1.750 |
band at 460nm |
inert |
inert |
ACAM Lab
320 |
TABLES
|
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
nx
min |
nx max |
ny
min |
ny
max |
nz
min |
nz
max |
Reference |
|
Diaspore |
1.68 |
1.753 |
0.046 |
0.05 |
3.2 |
3.5 |
|
|
|
|
|
|
Gemmo.eu 2013 |
|
Diaspore |
1.682 |
1.752 |
0.046 |
0.05 |
3.3 |
3.52 |
1.682 |
1.706 |
1.705 |
1.725 |
1.730 |
1.752 |
http://www.geminterest.com |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.35 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 2008 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.8 |
1.702 |
1.702 |
|
|
1.750 |
1.750 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.35 |
1.702 |
1.702 |
1.722 |
1.722 |
1.750 |
1.750 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.5 |
|
|
|
|
|
|
http://www.gemmology.be |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.5 |
1.702 |
1.702 |
1.722 |
1.722 |
1.750 |
1.750 |
Joel Arem, Color Encyclopedia of Gemstones,
1987 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.35 |
|
|
|
|
|
|
Gems, R Webster, 5th edition 1994 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.5 |
|
|
|
|
|
|
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
|
Diaspore |
1.702 |
1.75 |
0.048 |
0.048 |
3.3 |
3.5 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause of
colour |
Reference |
|
Diaspore |
colour change |
the colour change effect is presumably due to interferred manganese and
iron contents |
The Australian Gemmologist 2009, Vol23,
N°12, p566 |
|
Diaspore |
colour change |
In color-change diaspore, Cr3+, [Fe2+-Ti4+], and V3+may all play a role
in causing the color-change effect |
Gems & gemology 2018 Fall, p 326 |
|
Diaspore |
pink |
spectral features indicate that yhe colouration is due to a combination
of Fe³+,V³+, Cr³+ and probably Mn³+ |
The Journal of Gemmology Vo 37 (3)
2020, p 242 |
MINERAL
INCLUSIONS
LOCALITIES
CHEMICAL DATA