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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Amber

1.5

1.54

1

1.05

yellow to brownish yellow, brownish red

Sumatra, Indonesia

1.92 to 14.45 cts

 

chalky blue

strong chalky blue

The Australian Gemmologist 2013 Oct-Dec, Vol 25, N)4, p142-145

Amber

1.53

1.54

1.03

1.09

yellow, greenish yellow, brownish yellow, brown, orange-yellow

Khamti, Sagaing Region, Myanmar

RI spot readings

 

weak ch bluealky blue or greenish

strong chalky blue

The Journal of Gemmology 2020 Vol 37 (3), p314-322

Amber

1.538

1.54

1.03

1.04

dark golden yellow, orange-red, orange

Mexico

 

 

 

weak chalky white to strong light blue

The Journal of Gemmology 2017 Vol 35-8, p 752-765

Amber (heat treated)

1.54

1.55

1.05

1.06

green

 

two stage heating process

IR : 820 cm-1 feature  (not in untreated amber)

dark green

whitish blue

Gems & Gemology 2009 Fall, p158-177

Amber

1.54

1.55

1.03

1.05

white, yellow, yellowish brown, reddish brown, dark brown

Hti Lin, Myanmar

 

 

weak chalky blue

very strong chalky blue

The Journal of Gemmology 2015 Vol 34, No7, p606-615

Amber

1.54

1.55

1.03

1.06

pale ‘lemon’ yellow, ‘honey’ yellow and brownish yellow to dark brown,  ‘cherry’ red and ‘tea-leaf’ green to dark greenish brown

Khamti, Sagaing Region, Myanmar

32 samples, 0.72 to 55.67 ct

 

weak chalky blue to light purple, pink

strong, chalky blue to light purple, pink

The Journal of Gemmology 2018 36(2), p 106-107

Amber

 

 

1.02

1.05

gold, reddish brown, red, yellowish white, greenish yellow

Myanmar

transparent to opaque

 

 

violetish blue, whitish blue

The Journal of Gemmology 2020 Vol 37 (2), p144-161

 

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Amber

1.535

1.545

1.05

1.15

Gemmo.eu 2014

Amber

1.537

1.545

1.05

1.1

http://www.geminterest.com 

Amber

1.539

1.545

1

1.1

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

Amber

1.539

1.545

1.05

1.1

Gemmological Tables, Ulrich Henn, 2004 

Amber

1.539

1.545

1.06

1.1

Bestimmungstabellen für Edelsteine, Birgit Günther, 1981 

Amber

1.539

1.545

1.03

1.1

John Sinkakas, Gemstone and mineral data book,1972 

Amber

1.539

1.545

1

1.1

Gemology Tools Professional 2010

Amber

1.54

1.54

1.03

1.1

Gems, R Webster, 5th edition 1994 

Amber

1.54

1.54

1.06

1.1

Tabellen zur Edelstein-Bestimmung, Pschichholz FGA, 1975 

Amber

1.54

1.54

1.05

1.1

http://www.gemmology.be 

Amber

1.54

1.54

1.05

1.1

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

Amber

1.54

1.54

1.05

1.096

Joel Arem, Color Encyclopedia of Gemstones, 1987 

 

CAUSE OF COLOUR

Stone

Colour

Cause of colour

Reference

Amber

blue and green

fluorescence under visible light in Dominican amber, blue to light scattering in Baltic amber

Gems & Gemology Summer 1988

Amber

green (treated)

appears to result from light scattering from fine clouds of inclusions

Gems & Gemology Fall 2009 p161

Amber

yellow, orange, red, brown

charge transfer processes in large organic molecules

Gems & Gemology Summer 1988

 

MINERAL INCLUSIONS

Inclusion

Stone

Reference

feldspar

Amber

Gems & Gemology 2010 Winter, p309

jet

Amber

Gems & Gemology 2010 Winter, p309

pyrite

Amber

Gems & gemology 1985 summer p108

quartz

Amber

Gems & Gemology 2010 Winter, p309

 

LOCALITIES