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INVESTIGATIONS

Stone

RI min

RI max

Dens min

Dens max

Colour

Location

Info

Spectrum

UVS

UVL

Reference

Ivory hornbill

1.51

1.54

 

 

pale to bright yellow, orangy yellow, red

 

beads and carvings

 

yellow: inert to very weak; red : inert to weak bluish

yellow: inert to whitish, red : inert to bluish

The Journal of Gemmology 2014 Vol 34/N1, p42-49

Ivory hornbill

1.52

1.53

1.3

1.3

yellowish brown, carmine

 

translucent, hardness 3, hot point: burning hair

 

 

greenish

The Journal of Gemmology 1982 Vol18, N1, p8-19

Ivory hornbill

1.55

1.55

1.28

1.28

 

 

hardness 2.5, hotpoint reaction: burnt hair

 

white to bluish white

 

Gems & Gemology 1981 summer p96-97

Ivory hornbill

1.55

1.6

 

 

light brownish yellow with a few carmine red to dark brown areas

 

burnt hair odor with hot needle test

 

chalky bluish white (brownish yellow area), strong red (red area)

chalky bluish white (brownish yellow area), strong red (red area)

Gems & Gemology 2001 Winter, p 323

 

TABLES

Stone

RI min

RI max

Dens min

Dens max

Reference

Ivory hornbill

1.52

1.53

1.26

1.35

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

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

 

CHEMICAL DATA (%)