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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 diamond - cape series type 1a

See my  DECLARATION OF COPYRIGHT

Colour Properties of Diamond Cape Series Type 1a

Colour

Almost colourless to pale yellow

Cause of colour

Nitrogen colour centre

Optical Character

Isotropic

Pleochroism

Not applicable

Colour change

Not applicable

Spectrum; no polar, calibration in nm.

The diagnostic line at 415 strengthens with intensity of colour. Other faint lines in this system appear in deeper coloured stones ,at 423;435;451;465 and a stronger one at 478.

Ordinary ray

Not applicable

Extraordinary ray

Not applicable

Alpha ray

Not applicable

Beta ray

Not applicable

Gamma ray

Not applicable

Emission lines

No

Database reference

CS1; BL2 and BN1

Notes

 A suitable blue filter will help to detect the line at 415nm.

 

Copyright John S. Harris 2000-2016

 

SPECTRA OF

 PRINCIPAL 

COMMERCIAL GEMS

ALEXANDRITE

ALMANDINE GARNET

CHRYSOBERYL

EMERALD

GREEN JADEITE

PERIDOT

RUBY

BLUE SAPPHIRE

RED SPINEL

GREEN & BLUE SPINEL

  SYN. BLUE SPINEL &  Co. GLASS

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