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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Diamond

 

 

 

 

black

 

1.75 ct, cause of colour: natural radiation stains

 

 

 

Gems & Gemology 2013 Winter, p252

Diamond

 

 

3.17

3.45

black, olive black, greyish olive

 

carbonado (polycristalline)

 

 

 

Gemmologie, Zeitschrift der Deutschen Gemmologischen Gesellschaft 2004

Synthetic diamond

 

 

 

 

blue

 

HPHT-grown, 10.08ct

 

yellow

strong red-orange

Gems & Gemology 2016 Winter, p416

Synthetic diamond

 

 

 

 

colourless

 

CVD, 5.19ct

 

 

 

Gems & Gemology 2016 Winter, p414-415

Synthetic diamond

 

 

 

 

colourless, near-colourless, fancy-colour

 

improvements in colour and clarity, larger (0.14-0.71ct)

737nm emission (Si-related)

 

 

Gems & Gemology 2007 winter , p294-312

Diamond

 

 

 

 

fancy vivid orange

 

5.54ct

 

moderate orange

moderate yellow

Gems & Gemology 1997 Fall, p213

Diamond

 

 

 

 

Fancy Vivid purple

 

7.34 ct

a broad absorption band centred at about 550 nm

very weak yellow

weak to medium yellow

The Journal of Gemmology 2002 Vol 28, N°2, p7-12

Diamond

 

 

 

 

pink

 

 

 

 

 

Gems & Gemology 2005 Spring p36-41

Diamond

 

 

 

 

pink to red

 

 

415, 503, 575, 637 (most intense), mostly weak 496, and sometimes 594

chalky: orange, yellow

chalky : yellow, green, orange, sometimes blue

Gems & Gemology 2005 Spring p6-19

chameleon diamond

 

 

 

 

thermochromic colour change and/or photochromic behavior

 

 

 

 

 

Gems & Gemology 2005 Spring p20-34

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Diamond

2.415

2.42

3.5

3.54

Gemmo.eu 2017

Synthetic diamond

2.415

2.42

3.5

3.54

Gemmo.eu 2017

Diamond

2.417

2.417

3.51

3.53

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Diamond

2.417

2.419

3.51

3.53

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

Synthetic diamond

2.417

2.417

3.52

3.52

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

Diamond

2.417

2.417

3.52

3.52

Gemmological Tables, Ulrich Henn, 2004 

Synthetic diamond

2.417

2.417

3.52

352

Gemmological Tables, Ulrich Henn, 2004 

Diamond

2.417

2.417

2.9

3.55

http://www.gemmology.be 

Synthetic diamond

2.417

2.419

3.47

3.55

http://www.gemmology.be 

Diamond

2.417

2.417

3.51

3.53

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Diamond

2.417

2.417

3.5

3.54

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

Diamond

2.417

2.417

3.51

3.53

Gemology Tools Professional 2010

Synthetic diamond

2.417

2.417

3.51

4

Gemology Tools Professional 2010

Diamond

2.418

2.418

3.51

3.52

John Sinkakas, Gemstone and mineral data book,1972 

Diamond

2.42

2.42

3.52

3.52

Gems, R Webster, 5th edition 1994 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Diamond

black

all types: mostly black inclusions (magnetite, hematite, native Fe)

Gems & Gemologie Fall 2003 p200-209

Diamond

black

strong plastic deformation

Gems & Gemology 2011 Fall, p223

Diamond

black (treated)

type Ia : irradiation, GR1

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

blue

type IIb : band transitions caused by the presence of dispersed boron atoms

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

blue

type Ia and IIa : irradiation, GR1

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

blue

by a scattering of light in the diamond from the clouds of pinpoint inclusions

Gems & Gemology 2004 Fall, p245

Diamond

brown

all types : unknown center related to deformation

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

brown (treated)

type Ia : various nitrogen-related defects (N3, H3, H4, others)

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

brownish orange

type Ia: N3 + vacancies trapped at nitrogen aggregates (N3 + H3 and rarely H4)

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

green

type Ia & Iia : irradiation + brown or yellow component

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

green (bluish to yellowish) treated

type Ia : irradiation , GR1

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

green various shades

type Ia : various unknown defects

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

grey (often bluish)

type IIb : traces of boron ?

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

grey (often yellowish)

type Ia : hydrogen-related defects

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

greyish blue

type Ia : hydrogen-related defects

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

greyish green

type Ia : hydrogen-related defects

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

greyish yellow

type Ia : hydrogen-related defects

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

pale pink

type IIa : vacancy trapped adjacent to isolated nitrogen , N-V

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

pink to purple (treated)

type Ib (often with Ia) : vacancy trapped adjacent to isolated nitrogen,  N-V

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

purple, pink, red

Ia & IIa : unknown center related to deformation

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

violet

type Ia : hydrogen-related defects

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

white

type Ia : unknown inclusions

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

yellow

type Ia : aggregate of 3 nitrogen atoms, N3

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

yellow

type Ib : isolated nitrogen

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

yellow (treated)

type Ia : N3 + vacancies trapped at nitrogen aggregates (N3 + H3 and H4)

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

yellowish green

type Ia : fluorescence, H3

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

Diamond

yellowish orange to pure orange

type Ia: unknown, nitrogen related, "480nm band"

The Nature of Diamonds, George E. Harlow, Cambridge University Press, 1997, p23-47 (chapter by Emmanuel Fritsch)

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

actinoliet

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

apatite

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

barite

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

calcite

Diamond

The Australian Gemmologist 2003 Vol21, N°9,p357

chevkinite

Diamond

Gems & Gemology Summer 2001 p132

chlorite

Diamond

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

chromite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

coesite

Diamond

Internal World of Gemstones, Gübelin, 1983

cubanite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

diamond

Diamond

Internal World of Gemstones, Gübelin, 1983

diopside

Diamond

Internal World of Gemstones, Gübelin, 1983

enstatite

Diamond

Internal World of Gemstones, Gübelin, 1983

ferropericlase

Diamond

Gems & Gemology 2016 Winter, p423-424

fluorite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

forsterite

Diamond

Internal World of Gemstones, Gübelin, 1983

goethite

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

graphite

Diamond

Internal World of Gemstones, Gübelin, 1983

hematite

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

hornblende

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

ilmenite

Diamond

Internal World of Gemstones, Gübelin, 1983

iron

Diamond

The MicroWorld of Diamonds, Koivula, 2000

kaolinite

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

kyanite

Diamond

The Journal of Gemmology 1998, Vol 26, N°4, p222-225

loparite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

magnetite

Diamond

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

melilite

Diamond

The Australian Gemmologist 2003 Vol21, N°9,p357

moissanite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

molybdenite

Diamond

The Australian Gemmologist 2003 Vol21, N°9,p357

omphacite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

pentlandite

Diamond

Internal World of Gemstones, Gübelin, 1983

picotite

Diamond

Internal World of Gemstones, Gübelin, 1983

pyrite

Diamond

Internal World of Gemstones, Gübelin, 1983

pyrope

Diamond

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

pyrrhotite

Diamond

Internal World of Gemstones, Gübelin, 1983

quartz

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

ruby

Diamond

Gems & Gemology Volume 17, Number 3 / Fall 1981

rutile

Diamond

Internal World of Gemstones, Gübelin, 1983

sanidine

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

sapphire

Diamond

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

sellaite

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

staurolite

Diamond

The MicroWorld of Diamonds, Koivula, 2000

titanite

Diamond

The Australian Gemmologist 2003 Vol21, N°9,p357

xenotime

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

zircon

Diamond

Dr. W.F. Eppler, Praktische Gemmologie, 1984.

 

LOCALITIES

Diamond

Camutue mine

 

Lunda Norte Province

Angola

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Camafuca-Camazambo Mine

Calonda area

Lunda Norte Province

Angola

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Catoca mine

Catoca kimberlite field

Lunda Sul Province

Angola

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Gareth pipe

Merlin project

Northern Territory

Australia

Gems & Gemology 2003 Fall p222

Diamond

Ellendale field

Kimberley Region

Western Australia

Australia

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Lake Argyle area

Wyndham-East Kimberley Shire

Western Australia

Australia

Gems & Gemology 1990 Spring p24

Diamond

Letlhakane Mine

Letlhakane

Central District

Botswana

Gems & Gemology 1990 Spring p24

Diamond

Orapa Mine

Orapa

Central District

Botswana

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Jwaneng Mine

Kanye

Southern District

Botswana

Lapis 1994/11

Diamond

 

Chapada Diamantina

Bahia

Brazil

Gems & Gemology 1990 Spring p24

Diamond

 

Diamantino-Alto Paraguai District

Mato Grosso

Brazil

Gems & Gemology 1990 Spring p24

Diamond

 

Nortelandia

Mato Grosso

Brazil

Gems & Gemology 1990 Spring p24

Diamond

 

Poxoréo

Mato Grosso

Brazil

Gems & Gemology 1990 Spring p24

Diamond

 

Diamantina

Minas Gerais

Brazil

Gems & Gemology 1990 Spring p24

Diamond

 

Rio Tocantin river

Para

Brazil

Gems & Gemology 1990 Spring p24

Diamond

Snap Lake project

Camsell Lake

Northwest Territories

Canada

Rocks & Minerals 81:278-283

Diamond

Jericho kimberlite pipe

Contwoyto Lake

Northwest Territories

Canada

Journal of Petrology 40:79-104

Diamond

Diavik Mine

Lac de Gras

Northwest Territories

Canada

Rocks & Minerals 81:278-283

Diamond

Ekati Mine

Lac de Gras

Northwest Territories

Canada

Rocks & Minerals 81:278-283

Diamond

 

Birim diamond field

Eastern Region

Ghana

Gems & Gemology 1990 Spring p24

Diamond

Aredor Mine

Gbenko

 

Guinea

Gems & Gemology 1990 Spring p24

Diamond

Mazaruni river

Imbaimadai

Cuyuni-Mazaruni

Guyana

Fleischer, R. (1998): Mineralium Deposita 33, 238-254.

Diamond

Golconda Mines, Golconda

Hyderabad District

Andhra Pradesh

India

Lapis 1994/11

Diamond

 

 

Kalimantan Island (Borneo Island)

Indonesia

Gems & Gemology 1990 Spring p24

Diamond

Kao kimberlite pipe

 

Buthe Buthe district

Lesotho

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Elizabeth Bay Mine

Lüderitz District

 

Namibia

Gems & Gemology 1990 Spring p24

Diamond

 

Orange River mining area

Karas Region

Namibia

Gems & Gemology 1990 Spring p24

Diamant

Lomonosov pipe, Zolotitsa occurrence, Zimny Bereg kimberlite field

Zimny Bereg District

Arkhangel'skaja Oblast'

Russia

Gems & Gemology Summer 2017 p144-164

Diamond

Mir (Myr) Pipe, Mirny

Saha (Sakha) Republic (Yakutia)

Siberia

Russia

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

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

Saha (Sakha) Republic (Yakutia)

Siberia

Russia

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Zarnitsa pipe, Daldyn, Daldyn-Alakit kimberlite field

Saha (Sakha) Republic (Yakutia)

Siberia

Russia

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Aikhal

Yakutia

Siberia

Russia

Gems & Gemology 1990 Spring p24

Diamond

Koffiefontein Mine

Koffiefontein

Free State

South Africa

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Premier mine

Cullinan, Kimberley

Gauteng

South Africa

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

De Beers diamond mine

Kimberley

Northern Cape

South Africa

Minerals of South Africa, Bruce Cairncross-Roger Dixon, Geological Society of South Africa, 1995

Diamond

Finsch mine

 

Northern Cape Province

South Africa

The Nature of Diamonds (Harlow)The Nature of Diamonds (Harlow), 1997

Diamond

Roberts Victor Mine

Boshof

Orange Free State

South Africa

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Jagersfontein kimberlite

Jagersfontein

Orange Free State

South Africa

The Journal of Gemmology , 1984, XIX, 4, p353

Diamond

Dokolwayo Mine

Dokolwayo

Lubombo District

Swaziland

Gems & Gemology 1990 Spring p24

Diamond

Mwadui Mine (Williamson Mine)

Mwadui

Tabora Region

Tanzania

Mineralogical Record 1/2004

Diamond

 

Guaniamo

Bolivar

Venezuela

Gems & Gemology 1990 Spring p24

 

CHEMICAL DATA