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

1.7

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

1.702

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
color change from light greenish yellow in daylight to light pinkish yellow in incandescent light

 

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

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA

 
Gemsdat
 

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