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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Locality

Info

Spectrum

UVS

UVL

Reference

Pyrope

1.717

1.73

3.58

3.67

pale purple to purplish pink, with very low to moderate saturation

Dora Maira Massif, Italy

 

 

 

 

Gems & Gemology 2001 fall p198-204

Pyrope

1.73

1.73

3.73

3.73

purplish red

Umba Valley, Tanga Region, Tanzania

3.87ct

broad absorption below 405nm; lines at 435, 500, 525, 575nm

inert

inert

GIA Gem Database  33229

Pyrope

1.73

1.73

 

 

 

 

0.18ct, composition: Prp79Alm12Grs9

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope

1.735

1.735

3.69

3.69

pale brownish pink

Tunduru, Tanzania

3.14 ct

absorption below 430 nm, and lines at 505, 527,and about 576 nm

inert

faint red

Gems & Gemology 1996 Summer, p124-125

Pyrope

1.737

1.737

3.738

3.738

light pink

 

2.46ct

line 432nm, band 490-505nm, lines at 525 and 570nm, weak Cr lines at 650 and 670nm

inert

inert

The Journal of Gemmology 1984 Vol XIX, N°4, p311

Pyrope

1.74

1.74

3.72

3.72

almost black, dark brown

 

cabochon, numerous black ilmenite inclusions

general absorption up to about 480 nm and again above 620 nm.

 

 

Gems & Gemology 1988 Summer, p116

Cr Pyrope

1.742

1.742

3.72

3.72

 

 

5.37ct, Prp58Grs22Alm16

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope

1.743

1.743

3.76

3.76

red

Garnet Ridge, Arizona

3.76ct

 

inert

inert

ACAM lab  2122

Cr Pyrope

1.744

1.744

3.7

3.7

 

 

1.96ct, composition: Grs57Prp27Alm16

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope

1.744

1.744

3.77

3.77

 

 

1.27ct, composition: Prp74Alm25Sps1

 

 

 

Gems & Gemology 2011 Winter, p274

Pyrope

1.745

1.745

3.79

3.79

pink-violet

 

0.63ct

 

 

 

ACAM lab  2149

Pyrope

1.748

1.75

 

 

fire red

Podsedice, 10km south of Lovosice, Bohemia, Czech Republic

currently (1991) mined :very small stones, average 0.25ct

 

 

 

Gems & Gemology 1991 Fall, p171-173

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Pyrope

1.705

1.766

3.51

3.9

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

Pyrope

1.71

1.742

3.67

3.8

http://www.geminterest.com 

Pyrope

1.713

1.75

3.55

3.85

Gemmo.eu 

Pyrope

1.714

1.742

3.65

3.8

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

Pyrope

1.72

1.756

3.62

3.87

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Pyrope

1.72

1.756

3.65

3.9

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Pyrope

1.72

1.756

3.62

3.87

Gemology Tools Professional 2010

Pyrope

1.73

1.766

3.65

3.87

Joel Arem, Color Encyclopedia of Gemstones, 1987 

Pyrope

1.73

1.75

3.65

3.8

Gemmological Tables, Ulrich Henn, 2004 

Pyrope

1.73

1.75

3.65

3.8

John Sinkakas, Gemstone and mineral data book,1972 

Pyrope

1.73

1.75

3.65

3.7

Gems, R Webster, 5th edition 1994 

Pyrope

1.732

1.75

3.65

3.8

http://www.gemmology.be 

Pyrope

1.732

1.75

3.65

3.8

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

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Pyrope

brownish red

Fe²+ in distorted cubic coordination

Gems & Gemology Summer 1988

Pyrope

colour change

V³+ and/or Cr³+ in octahedral coordination

Gems & Gemology Summer 1988

Pyrope

red

Fe²+ in distorted cubic coordination and Cr³+ in octahedral coordination

Gems & Gemology Summer 1988

Pyrope

red-orange

Mn²+ in distorted cubic coordination

Mr. Dominique Flies, La couleur des grenats, l’Université de Nantes, 2008

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

apatite

Pyrope

Gemmological Tables, Ulrich Henn , GGA, 2004

chromite

Pyrope

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

diamond

Pyrope

Mineralogical Record, 24 (1) 1993 p64

diopside

Pyrope

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

forsterite

Pyrope

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

ilmenite

Pyrope

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

rutile

Pyrope

www.geminterest.com

zircon

Pyrope

www.geminterest.com

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Pyrope

 

Shuangyashan Prefecture

 Heilongjiang Province

China

Gems & Gemology Fall 2010, p209

Pyrope

 

Trebenice

Bohemia

Czech Republic

Joel Arem, Color Encyclopedia of Gemstones, 1987

Pyrope

 

Bhadrachalam

Andhra Pradesh

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Angul

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Balangir

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Deogarh

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Kalahandi

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Koraput

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Phulabani

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Sambalpur

Orissa

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Bendrie

Rajasthan (Rajputana)

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Kakaoria

Rajasthan (Rajputana)

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Sangwa

Rajasthan (Rajputana)

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Sarwad

Rajasthan (Rajputana)

India

Gems & Gemology Fall 2010, p209

Pyrope

 

Udaipur

Rajasthan (Rajputana)

India

Gems & Gemology Fall 2010, p209

Pyrope

Dora Maira Massif

Parigi

Martiniana Po, Piemonte

Italy

Geïllustreerde Mineralen Encyclopedie, Petr Korbel & Milan Novak, 2001

Pyrope

 

Marolambo

Toamasina (Tamatave) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

 

Ampahiny

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

 

Antaratra

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

 

Bekily District

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

 

Fotodrevo

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

 

Sakoandroa

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

 

Tranoroa

Tuléar (Toliara) Province

Madagascar

Gems & Gemology Fall 2010, p209

Pyrope

Shavaryn Tsaram, Tariat

Hangai highland

Arhangay Aimag

Mongolia

Gems & Gemology Fall 2010, p209

Pyrope

Udachnaya-Vostochnaya pipe, Daldyn, Daldyn-Alakit kimberlite field

Saha (Sakha) Republic (Yakutia)

Siberia

Russia

Gems & Gemology Fall 2010, p209

Pyrope

 

 

 

Somaliland

The Journal of Gemmology, 2000, Vol27, N°3, p148

Pyrope

Umba Valley

Lelatema Mts

Arusha Region

Tanzania

Gemmologie, 1997, Mar,p31

Pyrope

 

Namaputa

Lindi Province

Tanzania

Gemmologie, 1997, Mar,p31

Pyrope

 

 

Lindi Region

Tanzania

Gems & Gemology Fall 2010, p209

Pyrope

 

Tunduru-Songea area

Ruvuma Region

Tanzania

Gemmologie, 1997, Mar,p31

Pyrope

 

Sangu

Eastern Province

Zambia

Gems & Gemology Fall 2010, p209

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

SiO2

Al2O3

MnO

MgO

FeO

TiO2

CaO

Na2O

Cr2O3

V2O3

Fe2O3

K2O

Pyrope

purplish pink

Dora Maira Massif

Italy

Gems & Gemology 2001 Fall p204

44.46

26.07

0.02

27.97

1.48

0.02

0.59

 

 

 

 

 

Pyrope

purplish pink

Dora Maira Massif

Italy

Gems & Gemology 2001 Fall p204

44.13

25.81

0.05

27.16

2.5

0.01

0.61

 

 

 

 

 

Pyrope

red

Podsedice, Bohemia

Czech Republic

Gems & Gemology 1991 Fall, p173

41.46

21.51

0.32

21.29

9.17

0.7

4.45

 

1.66

0.09

 

 

Pyrope

red

Podsedice, Bohemia

Czech Republic

Gems & Gemology 1991 Fall, p173

41.06

21.39

0.31

20.82

9.1

0.55

4.48

 

1.76

0.05

 

 

Pyrope

purplish pink

Dora Maira Massif

Italy

Gems & Gemology 2001 Fall p204

44.02

25.72

0.05

26.41

3.33

0.04

0.94

 

 

 

 

 

Pyrope

red

 

Somaliland

The Journal of Gemmology 2000, Vol27, N°3,p148

41.79

23.28

0.27

17.95

9.54

0.06

6.3

 

0.09

 

0.35

 

Pyrope

red

Arizona

USA

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

40.81

23.07

0.34

20.49

7.03

0.21

3.81

0.04

1.41

 

3

0.01

Pyrope

light pink

 

 

The Journal of Gemmology 1984, XIX, 4, p312

45.2

25.33

 

28.5