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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Malaya garnet - Pyrope-Spessartine

1.739

1.782

3.77

4.04

light pink, pink, orange

Bekily, Madagascar

 

bands 503, 610, 687 (Fe²+) and at 483 (Mn²+)

 

 

Gems & Gemology 2001 winter p296-308

colour change pyrope-spessartine

1.74

1.773

3.75

3.99

purple, red, orange and yellow

 

 

 

 

 

Gems & Gemology 1984 Winter, p200-207

Pyrope-spessartine

1.746

1.746

3.79

3.79

purplish red

Madagascar

44.28ct

broad absorption below 430nm; lines at 460, 505, 525, 575nm

inert

inert

GIA Gem Database  34387

Pyrope-spessartine

1.75

1.755

3.77

3.83

light reddish orange

Lindi Province, Tanzania

 

 

inert

inert

Gems & Gemology 2012 Summer, p144-145

colour change pyrope-spessartine

1.75

1.75

3.84

3.84

greenish brown, colour change to reddish

Tanzania

0.99ct

Cr line

weak red

inert

ACAM lab  2247

colour change pyrope-spessartine

1.751

1.798

3.78

4.1

colour changing from greenish-grey to reddish-violet

Tunduru-Songea region, Tanzania

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1997 Mar, p38-39

colour change pyrope-spessartine

1.751

1.751

3.85

3.85

 

 

1.88ct, composition: Prp63Sps20Alm17

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope-spessartine

1.751

1.751

3.82

3.82

pink with faint brown tint (daylight) - reddish pink (incandescent lighting)

 

3.22ct, anomalous extinction

 

inert

inert

The Journal of Gemmology 2016 Vol 35, No. 1, p 10-11

Pyrope-spessartine

1.753

1.753

3.85

3.85

greyish with a tinge of green colour-changing to pale violet

Sri Lanka

2.54 ct

575nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2000 Mar, p2

Malaya garnet - Pyrope-Spessartine

1.755

1.755

3.862

3.862

 

 

6.93 ct, Chelsea : reddish pink

 

inert

inert

http://www.geminterest.com 2008

Pyrope-spessartine

1.756

1.756

3.85

3.85

pink

Lindi Province, Tanzania

2.29ct

 

inert

inert

Gems & Gemology 2006 Spring, p66-67

Pyrope-spessartine

1.757

1.757

3.86

3.86

orange

Umba Valley, Tanga Region, Tanzania

13.80ct

broad absorption below 430nm; lines at 460, 480, 500, 525nm

inert

inert

GIA Gem Database  35068

colour change pyrope-spessartine

1.759

1.772

3.82

3.88

 

Sri Lanka

 

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 1997 Mar, p5-6

colour change pyrope-spessartine

1.76

1.768

3.76

3.89

blue-green to red violet

Nigeria

0.39 to 0.53 ct

410, 422, 485, 576, 687nm

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2003 Mar, p3-4

colour change pyrope-spessartine

1.76

1.76

3.88

3.88

Dark greyish greenish blue (day light) to dark greyish violet

Sri Lanka

0.99 ct, chelsea : orange, weak anomalous double refraction

400-450 nm cutoff, weak absorption at 450-470 nm, diffuse bands at 480-490nm, 504 and 520 nm, and 560-580 nm

inert

inert

Gems & Gemology 1998 Summer, p139

Pyrope-spessartine

1.76

1.76

3.89

3.9

brownish pinkish orange

Madagascar

0.95 and 1.60ct, strong anomalous double refraction

strong 430 and weak 500 nm bands

inert

inert to faint orange

Gems & Gemology 1998 Fall, p222

colour change pyrope-spessartine

1.76

1.77

3.93

4

colour change: yellow-green (daylight) to orange (incandescent light)

 

 

absorption lines in the blue and violet section, and very weak absorption bands at 520 and 573nm

 

 

Gems & Gemology 2017 Spring, p137-138

Pyrope-spessartine

1.762

1.762

3.89

3.89

colour change: greenish blue to purplish red or red

Nandagala, Tanzania

 

band at 400nm, broad absorption at 570nm

 

 

Gems & Gemology 2011 Fall, p240-241

colour change pyrope-spessartine

1.762

1.765

3.88

3.91

blue-green to purple

Kamtonga, Taita Hills, Kenya

 

575, 505 en cut-off 485nm; Vis-NIR: transmission 475nm, 650nm, absorption 486, 505, 577

inert

inert

Gems & Gemology 2009 Fall, p223-224

Malaya garnet - Pyrope-Spessartine

1.762

1.762

3.9

3.9

 

 

1.53ct, composition:: Prp47Sps46Alm7

 

 

 

Gems & Gemology 2011 Winter, p274

colour change pyrope-spessartine

1.763

1.77

 

 

colour change induced by V2O3

East Africa

 

 

 

 

Gems & Gemology 1988 fall p 176-177

Pyrope-spessartine

1.765

1.765

3.9

3.9

colour change: bluish-green to reddish violet

Toliara Province Madagascar

5.08ct

band 576

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2005 Sep, p66

Malaya garnet - Pyrope-Spessartine

1.765

1.765

3.91

3.91

 

 

2.27ct, composition:: Prp47Sps32Alm21

 

 

 

Gems & Gemology 2011 Winter, p274

colour change pyrope-spessartine

1.765

1.766

 

 

greenish yellow in daylight, and intense pink to red in incandescent light

Madagascar

2.52, 3.25, and 5.23 ct

Mn2+ bands at 207, 237, 242, and 245 nm, and two relatively weak Fe2+ bands at 199 and 218nm and broad V3+/Cr3+ absorption with a maximum at 571 nm

 

 

Gems & Gemology 1998 Fall, p222-223

colour change pyrope-spessartine

1.768

1.771

3.86

4.03

golden yellow to brownish red

Nigeria

0.74 to 1.98 ct, also almandine component

Mn²+ bands

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2003 Mar, p3-4

colour change pyrope-spessartine

1.77

1.77

3.94

3.94

bluish green, colour change

Madagascar

0.79ct

 

inert

inert

ACAM lab  1895

colour change pyrope-spessartine

1.77

1.77

3.91

3.91

Greyish greenish blue (daylight) to purple

Sri Lanka

0.48 and 0.59 ct, chelsea : orange, weak anomalous double refraction

435 nm cutoff; 460, 480, 504, and 520 nm lines, and wide band at 573 nm

inert

inert

Gems & Gemology 1998 Summer, p139

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Pyrope-Spessartine

1.739

1.775

3.83

4.16

Gemmo.eu 2013

Pyrope-Spessartine

1.742

1.8

3.81

3.88

Gemme, Dati per l'identificazione, P. De Stefano et al, 1993 

Pyrope-Spessartine

1.742

1.78

3.75

4

http://www.geminterest.com 

Malaya garnet - Pyrope-Spessartine

1.742

1.78

3.78

3.85

Gemology Tools Professional 2010

Pyrope-Spessartine

1.75

1.78

3.8

4.11

http://www.gemmology.be 

Pyrope-Spessartine

1.75

1.78

3.8

4.11

Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 

Malaya garnet - Pyrope-Spessartine

1.751

1.788

3.82

4.05

Gemmological Tables, Ulrich Henn, 2004 

colour change Pyrope-spessartine

1.753

1.772

3.8

4.18

Gemmological Tables, Ulrich Henn, 2004 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Pyrope-spessartine

colour change

V³+ and/or Cr³+ in octahedral coordination

Gems & Gemology Summer 1988

colour change Pyrope-spessartine

greyish greenish blue

probably combination of Mn²+ and V³+ absorptions are responsible for colour change

Gems&Gemology 1998, summer, p138

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

apatite

colour change Pyrope-spessartine

Gemmological Tables, Ulrich Henn , GGA, 2004

apatite

Pyrope-spessartine

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

graphite

Pyrope-spessartine

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

quartz

Malaya garnet - Pyrope-spessartine

http://www.gemlab.net

rutile

colour change Pyrope-spessartine

Gemmological Tables, Ulrich Henn , GGA, 2004

rutile

Malaya garnet - Pyrope-spessartine

http://www.gemlab.net

rutile

Pyrope-spessartine

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

zircon

Pyrope-spessartine

E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones, volume 2 (2005)

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Pyrope-spessartine

Bekily Department

Southwestern Region

Tuléar (Toliara) Province

Madagascar

Gems & Gemology 2001 winter p296

Pyrope-spessartine

Umba Valley

Lelatema Mts

Arusha Region

Tanzania

Gemmologie, 1997, Mar,p31

Pyrope-spessartine

 

Tunduru-Songea area

Ruvuma Region

Tanzania

Gemmologie, 1997, Mar,p31

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

V2O3

Fe2O3

K2O

CuO

NiO

colour change Pyrope-spessartine

different colours

 

 

Gems & Gemology 1984 Winter p202

40.07

22.44

17.22

12.75

4.4

0.12

5.32

 

0.33

0.39

 

 

 

 

colour change Pyrope-spessartine

yellow-green to red-brown

 

 

Gems & Gemology 1985 summer p117

39.5

21.7

22.9

7.3

1.8

0.3

6.9

 

0

0.3

 

 

 

 

colour change Pyrope-spessartine

brown to reddish brown (80% spessartine)

 

Madagascar

The Journal of Gemmology 2001, 27,7,p400

37.65

20.06

34.41

0.87

3.1

0.51

3.11

 

0.26

0.44

 

 

 

 

colour change Pyrope-spessartine

blue to blue with purplish hue, slight hue change

 

Madagascar

The Journal of Gemmology 2001, 27,7,p400

38.63

21.12

18.49

10.45

0.65

0.06

7.31

 

0.38

1.61

 

 

 

 

colour change Pyrope-spessartine

blue-greenish to purplish-blue

 

Madagascar

The Journal of Gemmology 2001, 27,7,p400

38.81

20.48

21.31

11.78

2.84

0.03

3.01

 

0.95

0.91

 

 

 

 

colour change Pyrope-spessartine

blue-greenish to purplish-blue

 

Madagascar

The Journal of Gemmology 2001, 27,7,p400

41.47

22.7

14.75

15.25

0.96

0.04

4.65

 

0.17

0.43

 

 

 

 

colour change Pyrope-spessartine

yellowish-green to pink-light purple

 

Madagascar

The Journal of Gemmology 2001, 27,7,p400

40.22

21.67

18.89

10.49

2.29

0.11

5.09

 

0.11

0.27

 

 

 

 

colour change Pyrope-spessartine

brownish-green to brownish-red (77% spessartine)

 

Madagascar

The Journal of Gemmology 2001, 27,7,p400

37.22

19.99

33.69

4.21

0.52

0.25

1.73

 

0.24

1.3

 

 

 

 

colour change Pyrope-spessartine

blue-green to purple red

 

Tanzania

Gems & Gemology 1970 summer p174-177

38.35

26.45

16.73

13.1

1.45

0.1418

2.38

 

0.54

0.324

 

 

0.0019

0.0041

colour change Pyrope-spessartine

green

 

Tanzania

The Journal of Gemmology 2007,30,5/6,307-319

39.23

21.67

24.18

8.71

0.51

0.08

3.56

0.03

0.36

1.22

 

0.02

 

 

Malaya garnet - Pyrope-Spessartine

yellowish-orange

 

Tanzania

The Journal of Gemmology 2007,30,5/6,307-319

40.73

23.23

15.99

14.23

3.53

0.03

2.34

0.02

0.01

0.01

0.06

0.01

 

 

Pyrope-spessartine

red

 

Madagascar

Gems & Gemology 2001 Winter, p300

40.3

23.1

3.39

16.18

14.41

0.05

1.68

 

0.11

0.13

 

 

 

 

Pyrope-spessartine

red

 

Madagascar

Gems & Gemology 2001 Winter, p300

40.2

23.28

1.29

15.18

19.24

0.05

1.56

 

0.04

0.05

 

 

 

 

Pyrope-spessartine

purplish pink

 

Madagascar

Gems & Gemology 2001 Winter, p300

42.3

24.14

0.2

18.27

16.79

0.01

1.02

 

0.03

0.01

 

 

 

 

Pyrope-spessartine

intens pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

39.93

23.01

12.82

14.69

6.99

0.04

2.03

 

0.16

0.16

 

 

 

 

Pyrope-spessartine

light pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

41.24

23.94

12.44

19.07

2

0.01

1.26

 

0.05

0.08

 

 

 

 

Pyrope-spessartine

light pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

40.96

23.59

14.81

16.94

2.13

0.01

1.81

 

0.09

0.11

 

 

 

 

Pyrope-spessartine

light pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

41.44

23.32

6.25

19.41

6.11

0.04

2.05

 

0.08

0.09

 

 

 

 

Pyrope-spessartine

orange

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

38.68

22.1

26.63

6.17

5.65

0.09

1.77

 

0.07

0.08

 

 

 

 

Pyrope-spessartine

orange-red

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

39.99

23.31

9.18

15.62

9.65

0.06

1.6

 

0.12

0.17

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

39.41

22.88

10.09

14.03

12.11

0.02

1.07

 

0.05

0.04

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

41.91

23.84

13.04

16.65

4.45

0.05

1.81

 

0.07

0.08

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

40.69

23.14

13.5

16.46

3.6

0.05

1.7

 

0.06

0.05

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

39.94

22.85

13.53

15.96

4.11

0.04

1.68

 

0.1

0.07

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

41.33

23.61

12.7

15.81

5.75

0.06

1.98

 

0.09

0.09

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

41.29

23.83

11.57

14.93

9.73

0.04

1.05

 

0.05

0.03

 

 

 

 

Pyrope-spessartine

pink

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

40.34

23.34

10.42

15.31

10.07

0.03

1.07

 

0.05

0.05

 

 

 

 

Pyrope-spessartine

pinkish orange

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

40.97

23.27

16.72

14.89

3.61

0.06

1.23

 

0.04

0.04

 

 

 

 

Pyrope-spessartine

red

Bekily

Madagascar

Gems & Gemology 2001 Winter, p300

40.86

23

7.83

15.07

11.75

0.05

1.9

 

0.19

0.08

 

 

 

 

pyrope-spessartine-grossularite

yellowish-brown

 

Tanzania

The Journal of Gemmology 1982, Vol 18, N°3, p196

39.56

22.03

19.94

7.41

1.53

0.24

8.88

 

 

0.18