|
INVESTIGATIONS
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
Plastic, artificial product |
1.5 |
1.51 |
1.2 |
1.22 |
milky bluish white, realistic play of colour |
|
"opalite", moderate anomalous double refraction, hardness 2.5 |
general absorption from 537 to 584nm |
weak, superficial chalky blue-white overtone |
strong even bluish white, very slight orange at the edges |
Gems & Gemology 1989 Spring, p30-34 |
Plastic, artificial product |
1.5 |
1.5 |
|
|
bright gold to deep brown |
|
golden coral imitation |
|
inert |
inert |
Gems & Gemology 2015 Winter, p456 |
Plastic, artificial product |
1.53 |
|
1.97 |
1.97 |
orange-red |
|
bead 37.50ct, coral imitation, with coral inclusions |
|
orange |
orange |
Gems & Gemology 2015 Fall, p 341-342 |
Plastic, artificial product |
1.53 |
|
1.45 |
1.45 |
milky bluish white, realistic play of colour |
|
"opalite", opal imitation, spot RI |
|
|
|
http://gtljaipur.info/ProjectUpload/labDownLoad/LIC%2074%20_June2017.pdf |
Plastic, artificial product |
1.57 |
1.57 |
1.24 |
1.24 |
white with striations |
|
hardness 2, =polymer substance, with striations imitating Schreger lines |
|
inert |
inert |
Gems & Gemology 2019 Fall, p419 |
Plastic, artificial product |
|
|
1.2 |
1.2 |
|
|
trade name "opalus", opal imitation |
|
|
|
Gemmologie, Zeitschrift der Deutschen
Gemmologischen Gesellschaft 1996 Mar, p3 |
Plastic, artificial product |
|
|
|
1.26 |
|
|
walrus tusk imitation and sperm whale tooth imitation |
|
|
|
Gems & Gemology 2003 winter, p 341 |
TABLES
Stone |
RI
min |
RI
max |
Dens
min |
Dens
max |
Reference |
Plastics Imitation for coral, amber, pearl, ivory |
1.45 |
1.65 |
1.15 |
2.2 |
Gemmo.eu
|
Plastics Imitation for coral, amber, pearl, ivory |
1.47 |
1.7 |
1.05 |
1.55 |
Gemology Tools Professional 2010 |
Bakelite |
1.47 |
1.47 |
1.25 |
2 |
Gems, R Webster, 5th edition 1994 |
"pastoral" plastic |
1.48 |
1.49 |
1.18 |
1.2 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Plastics Imitation for coral, amber, pearl, ivory |
1.49 |
1.7 |
1.3 |
1.95 |
Gemmological Tables, Ulrich Henn,
2004 |
Celluloid |
1.495 |
1.52 |
1.36 |
1.8 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Celluloid |
1.495 |
1.68 |
1.04 |
1.8 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Celluloid |
1.495 |
1.52 |
1.25 |
1.8 |
http://www.gemmology.be |
Celluloid |
1.495 |
1.51 |
1.36 |
1.8 |
Gems, R Webster, 5th edition 1994 |
Celluloid |
1.495 |
1.52 |
1.25 |
1.8 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Perspex - lucite -plastic |
1.5 |
1.5 |
1.18 |
1.19 |
Gems, R Webster, 5th edition 1994 |
Bakelite |
1.5 |
1.7 |
1.25 |
1.9 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Bakelite |
1.5 |
1.7 |
1.25 |
1.35 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Bakelite |
1.5 |
1.7 |
1.25 |
1.29 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Casein |
1.53 |
1.56 |
1.32 |
1.34 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Polystyrene |
1.55 |
1.56 |
1.2 |
1.23 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Polystyrene |
1.55 |
1.56 |
1.2 |
1.23 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 2008 |
Polystyrene |
1.55 |
1.6 |
1.05 |
1.23 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Casein |
1.55 |
1.56 |
1.32 |
1.34 |
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Casein |
1.55 |
1.56 |
1.33 |
1.33 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Casein |
1.55 |
1.56 |
1.32 |
1.34 |
Gems, R Webster, 5th edition 1994 |
Polystyrene |
1.59 |
1.59 |
1.05 |
1.05 |
Gems, R Webster, 5th edition 1994 |
Bakelite |
1.61 |
1.66 |
1.25 |
1.3 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Bakelite |
|
|
1.25 |
1.3 |
John Sinkakas, Gemstone and mineral data
book,1972 |
CAUSE OF
COLOUR
CHEMICAL DATA
(%)