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  GEMSTONE SPECTRA

(EXCEL FILES)

COLOURLESS STONES

         CS1          

 RED STONES  

  RD1 Dark red

   RD2 Pinkish red

  RD3 Orangy red

RD4 Slightly purplish red

  RD5  Purplish red

PINK STONES 

  PK1 Lilac pink

   PK2 Pink and orangy pink

PK3  Brownish and purplish pink

ORANGE STONES

OR1

YELLOW STONES

YL1

GREEN STONES

GN1 Green

GN2 Yellowish and greyish green

GN3 Bluish green

 GN4 Dark and brownish green

BROWN STONES

BN1 Light brown

BN2 Dark brown

BLUE STONES

BL1 Blue

BL2 Greenish blue

BL3 Lavender and indigo blue

VIOLET AND PURPLE STONES

VT - PL Violet and Purple

   Periodically other gemstones will be added to these files

 

 

Diffraction spectra of synthetic blue spinel and cobalt glass

See my  DECLARATION OF COPYRIGHT

Colour properties of  synthetic blue spinel and cobalt glass

 

SYNTHETIC BLUE SPINEL

COBALT BLUE GLASS

Colour

Pale to deep intense blue

Pale to deep intense blue

Cause of colour

Cobalt

Cobalt

Optical Character

Isotropic

Isotropic

Pleochroism

Not applicable

Not applicable

Colour change

No

No

Spectrum; no polar, calibration in nm.

Three broad bands centred at 540;580;(Broadest) and 635:

Three broad bands centred at       535; 590 (Narrowest) and 655:

Ordinary ray

Not applicable

Not applicable

Extraordinary ray

Not applicable

Not applicable

Alpha ray

Not applicable

Not applicable

Beta ray

Not applicable

Not applicable

Gamma ray

Not applicable

Not applicable

Emission lines

No

No

Database reference

BL1;

BL1; BL3

Notes

Pale stones show weak vague bands, only one in red may be seen in some stones.

Copyright John S. Harris 2000-2016

 

SPECTRA OF

 PRINCIPAL 

COMMERCIAL GEMS

ALEXANDRITE

ALMANDINE GARNET

CHRYSOBERYL

DIAMOND

EMERALD

GREEN JADEITE

PERIDOT

RUBY

BLUE SAPPHIRE  

RED SPINEL

GREEN & BLUE SPINEL

SYN. COLOUR CHANGE CORUNDUM

ZIRCON (High type)

ZIRCON (Low type)

Other pages are under construction.

COLOUR FILTERS

 (EXCEL FILES)    

CF1 Basic Colour Filters

CF2 Special Colour Filters

EDUCATIONAL C. D.

  A GUIDE TO THE   SPECTROSCOPE