Gemlab.UK  Gemmological Spectroscopy      RUBY

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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 ruby

See my  DECLARATION OF COPYRIGHT

 

Colour Properties of Ruby

Colour

Red in various shades from pinkish to dark purplish red

Cause of colour

Chromium - Allochromatic

Optical Character

Uniaxial negative     

Pleochroism

Distinct – two shades of red

Colour change

No but redder in tungsten

Spectrum; no polar Calibration in nm.

Transmits mainly in red, orange and blue, violet absorbed. Lines at 694/693 may fluoresce. Weak lines at 668 and 659. Broad band centred at 550. Lines at 476/475 and 468.

Ordinary ray

694 stronger; 550 band broader; 475 stronger

Extraordinary ray

694/693 weaker; 668 missing 550 band narrower;

Alpha ray

Not applicable

Beta ray

Not applicable

Gamma ray

Not applicable

Emission lines

Yes at 694/693

Database reference

RDF0756 in RD4 See others in RD2; RD3; RD4 and RD5.

Notes

Natural and synthetic stones show a similar spectrum

Copyright John S. Harris 2000-2016

 

 

 SPECTRA OF

 PRINCIPAL 

COMMERCIAL GEMS

ALEXANDRITE

ALMANDINE GARNET

CHRYSOBERYL

DIAMOND

EMERALD

GREEN JADEITE

PERIDOT

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