Gemlab.UK    Gemmoloigcal  Spectroscopy                                                                                                                                 

                                                                              Visible Absorption Spectrum of a Mogok Zircon




       This web site is undergoing extensive reconstruction.             The Spectra Database is now back on line together with all the Excel files showing spectra and details of many gemstones.       Pages for particular gemstones will follow when updated and their links established.

      Colour Filters and the appropriate Excel files are back on line     and the CD "A Guide to the Spectroscope" is also available.


                                                                                              SPECTRA DATABASE    Images and Descriptions of Absorption and Emission Spectra.

                                                                                                    COLOUR FILTERS   The application of colour filters in gemtesting

                                                                                                                                THROUGH MY SPECTROSCOPE   Spectra of special interest  presented and discussed.

                                                                                                        PHOTOGRAPHY   How the images were captured on camera.

                                                                                                           ABOUT  THE AUTHOR   John S. Harris                                                                                                                                                                                                                                                                                                                                          


                                     A GUIDE TO THE SPECTROACOPE                 

           A Gemlab UK Production for Education in Gemmological Spectroscopy.                                                                                                                                                                                                                   This CD contains an animated Microsoft PowerPoint Slide Show

                                                   which can be controlled by the viewer.






Gemmology Resources 

The Gemmological Association of Great Britain

The Scottish Gemmological Association

Optical Spectroscopy Software by Dr. F. Menges 

Unique Original Jewellery by Richard Harris




The images and text shown on this web site are the sole intellectual property of John S. Harris. and may not be copied, transmitted, or used in any way without permission.

Permission may be granted for non-commercial use in education and research in which case please

apply to John Harris at



Copyright John S. Harris - from the year 2000 to the current date.