|
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 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.755 |
0.008 |
0.009 |
3.67 |
3.74 |
yellowish green, green, bluish
green (incandescent light : orangy red, red, purplish
red) |
Russia |
|
1.740 |
1.746 |
|
|
1.748 |
1.755 |
|
weak red or
inert |
bright
red |
Gems & Gemology 1996 fall,
p186-201 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.75 |
0.01 |
0.01 |
3.7 |
3.71 |
colour change : blue-green to
violet-red |
made by J.O. Crystal Company
Inc., Long Beach, USA |
"Nicholas Created Alexandrite", 1.08-1.10
ct |
1.740 |
1.740 |
1.743 |
1.743 |
1.750 |
1.750 |
Cr³+ |
strong
red |
strong
red |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1994 Jun, p2 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.756 |
0.008 |
0.009 |
3.7 |
3.72 |
|
from
Russia |
flux |
1.740 |
1.747 |
1.744 |
1.750 |
1.748 |
1.756 |
|
red |
red |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1992 Sep, p69-84 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.751 |
0.008 |
0.009 |
3.7 |
3.72 |
|
from
Russia |
pull method
Czochralsky |
1.740 |
1.742 |
1.744 |
1.745 |
1.748 |
1.751 |
|
strong
red |
strong
red |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1992 Sep, p69-84 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.751 |
0.008 |
0.009 |
3.7 |
3.72 |
|
from
Russia |
hydrothermal |
1.740 |
1.742 |
1.744 |
1.745 |
1.748 |
1.751 |
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1992 Sep, p69-84 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.749 |
0.009 |
0.009 |
3.72 |
3.72 |
bluish gree, colour
change |
|
0.35 ct |
1.740 |
1.740 |
1.743 |
1.743 |
1.749 |
1.749 |
|
strong
red |
strong
red |
ACAM lab
1784 |
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.749 |
0.009 |
0.009 |
3.72 |
3.72 |
strong colour change from
reddish purple in incandescent light to bluish green in
daylight |
|
1.26 ct, Czochralslzi-pulled,
"Allexite" |
|
|
|
|
|
|
|
moderate
red |
strong
red |
Gems & Gemology 1992 Fall,
p207 |
|
Chrysoberyl - synthetic
alexandrite |
1.741 |
1.749 |
0.008 |
0.008 |
3.68 |
3.68 |
bluish, colour
change |
|
0.39 ct, CZOCHRALSKI
method |
1.741 |
1.741 |
1.744 |
1.744 |
1.749 |
1.749 |
470nm,
Cr-lines |
orange-red |
red |
ACAM lab
4615 |
|
Chrysoberyl -
synthetic |
1.742 |
1.752 |
0.008 |
0.009 |
3.76 |
3.76 |
green |
|
vanadium-bearing |
1.742 |
1.743 |
|
|
1.751 |
1.752 |
|
|
|
Gems & Gemology 1997 Summer,
p148 |
|
Chrysoberyl - synthetic
alexandrite |
1.745 |
1.755 |
|
|
3.71 |
3.75 |
dark greyish green, with slight
purplish overtone, with greenish white-blue
eye |
|
cat's eye, "oily"
appearence |
|
|
|
|
|
|
lines at 680, 678, 665, 655,
645, 472, sometimes at 468nm |
weak chalky
yellow |
moderate
red |
Gems & Gemology 1987 Fall
p158-162 |
|
Chrysoberyl - synthetic
alexandrite |
1.747 |
1.756 |
0.009 |
0.009 |
3.72 |
3.72 |
green, colour
change |
Russia |
|
|
|
|
|
|
|
|
red |
intens red to
orange-red |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1988 37, Nr 3/4,
p85-88 |
|
Chrysoberyl - synthetic
alexandrite |
1.747 |
1.753 |
|
|
3.74 |
3.74 |
|
|
Inamori, cat's eye; chelsea:
red |
|
|
|
|
|
|
680, 650, 625, 616, 471nm
lines |
chalky
red |
chalky
red |
The Journal of Gemmology 1988
Vol 21, N°4,
p232-236 |
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 |
|
Chrysoberyl - synthetic
alexandrite |
1.739 |
1.751 |
0.008 |
0.009 |
3.7 |
3.73 |
1.739 |
1.742 |
1.741 |
1.750 |
1.748 |
1.751 |
http://www.geminterest.com
|
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.761 |
0.007 |
0.01 |
3.65 |
3.75 |
1.740 |
1.752 |
|
|
1.748 |
1.761 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.756 |
0.007 |
0.01 |
3.7 |
3.72 |
1.740 |
1.747 |
1.744 |
1.750 |
1.748 |
1.756 |
Gemmological Tables, Ulrich Henn, 2004
|
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.756 |
0.008 |
0.01 |
3.65 |
3.75 |
1.740 |
1.749 |
|
|
1.749 |
1.756 |
Bestimmungstabellen für Edelsteine, Birgit
Günther, 2008
|
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.755 |
0.008 |
0.01 |
3.71 |
3.75 |
|
|
|
|
|
|
Gemology Tools Professional 2010
|
|
Chrysoberyl - synthetic
alexandrite |
1.74 |
1.76 |
0.007 |
0.011 |
3.66 |
3.82 |
|
|
|
|
|
|
Gemmo.eu
|
CAUSE OF COLOUR
CHEMICAL DATA (%)
|
Stone |
Colour |
Origin |
Reference |
Al2O3 |
MnO |
FeO |
TiO2 |
Cr2O3 |
V2O3 |
Ga2O3 |
Fe2O3 |
GeO2 |
SnO2 | |
|
Chrysoberyl - synthetic
alexandrite |
|
"Seiko" |
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1987, Nr 3/4,
p121-131 |
|
|
|
|
0.14 |
|
|
0.25 |
|
|
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology Fall 1996
p198 |
76.76 |
0.01 |
0.87 |
0.01 |
2.49 |
0.01 |
0.03 |
|
0.79 |
0.03 |
|
Chrysoberyl - synthetic
alexandrite |
|
"Kyocera" |
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1987, Nr 3/4,
p121-131 |
|
|
|
|
0.11 |
|
|
0.02 |
|
|
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology Fall 1996
p198 |
78.87 |
0.01 |
0.34 |
0.01 |
0.62 |
0.01 |
0.06 |
|
1.08 |
0.08 |
|
Chrysoberyl - synthetic
alexandrite |
|
"Creative
Crystals" |
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1987, Nr 3/4,
p121-131 |
|
|
|
|
0.16 |
|
|
0.81 |
|
|
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
78.38 |
0.01 |
0.5 |
0.01 |
0.58 |
0.01 |
0.04 |
|
1.12 |
0.23 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
76.17 |
0.01 |
0.85 |
0.01 |
2.46 |
0.15 |
0.03 |
|
0.32 |
0.02 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
79.03 |
0.01 |
0.52 |
0.01 |
0.24 |
0.01 |
0.04 |
|
0.03 |
0.02 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
78.53 |
0.01 |
0.82 |
0.01 |
0.24 |
0.1 |
0.04 |
|
0.66 |
0.02 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
79.11 |
0.01 |
0.55 |
0.01 |
0.37 |
0.01 |
0.06 |
|
0.87 |
0.24 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
78.87 |
0.01 |
0.34 |
0.01 |
0.62 |
0.01 |
0.06 |
|
1.08 |
0.07 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
76.75 |
0.01 |
0.78 |
0.01 |
2.5 |
0.01 |
0.03 |
|
0.83 |
0.03 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
77.44 |
0.01 |
0.53 |
0.01 |
0.32 |
0.02 |
0.03 |
|
2.4 |
0.38 |
|
Chrysoberyl - synthetic alexandrite
flux |
|
|
Russia |
Gems & Gemology 1996 Fall
p186-201 |
77.72 |
0.01 |
1.34 |
0.03 |
0.46 |
0.85 |
0.03 |
|
0.02 |
0.05 |