GEM SPECTROSCOPE PDF

This band is stronger for the ordinary ray. These may reverse into fluorescent emission lines. Note: Fe-rich rubies may display Fe lines, in addition to the above. This has not been reported in synthetic corundum. Blue sapphire Slight absorption in the deep violet Three lines of decreasing strength at The lines are stronger for the ordinary ray.

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This band is stronger for the ordinary ray. These may reverse into fluorescent emission lines. Note: Fe-rich rubies may display Fe lines, in addition to the above. This has not been reported in synthetic corundum. Blue sapphire Slight absorption in the deep violet Three lines of decreasing strength at The lines are stronger for the ordinary ray.

Only a weak Thus the full 3-line complex is proof of natural origin. Broad band of weak absorption centered about nm in some deeply colored specimens. This has no diagnostic significance, being seen in both natural and synthetic corundums.

It is due to the ordinary ray. Crowningshield reported on a natural blue sapphire with the normal This has never been reported elsewhere. Anderson reported that Verneuil synthetic blue sapphires may have even weaker bands on either side of that at A vague blur is seen, or sensed, at about nm, just where the green ends and the blue begins.

The other is an even weaker blur in the violet at about nm. Note: Cr-rich natural or synthetic blue sapphires may display a weak Cr spectrum fluorescent lines at the end of the red. Only rarely has a weak Yellow sapphire Fe spectrum see blue sapphire above ; some gems may show a weak Cr spectrum Heat-treated Sri Lankan yellows may show complete absorption from to or nm. This is of no diagnostic value, as it is also found in some Verneuil synthetic corundums. On rare occasions, a weak line at about nm has been reported in Verneuil synthetic yellow sapphire.

Orange sapphire Combination of Fe and Cr spectra see blue sapphire and ruby above Heat-treated Sri Lankan oranges may show complete absorption from — or nm.

Green sapphire Strong and complete Fe spectrum see blue sapphire above. This is virtually always present in natural stones, but is not found in synthetic green sapphires. Some synthetic green sapphires show a line at , , and nm. This may be due to a combination of cobalt, vanadium and nickel. A narrow fluorescent emission line may be seen at about nm this gives the gem a change of color. All wavelengths are approximate only. Pleochroism can have a slight effect on the absorption spectrum.

By rotating a polaroid plate over the spectroscope eyepiece, the spectra of both the ordinary and extraordinary rays can be viewed independent of one another. A scanning spectroscope once produced by Gem Instruments. Rotating the calibrated drum on the right of the instrument while viewing the spectrum through the eyepiece rolls the spectrum past a crosshair.

When the absorption line is lined up with the crosshair, the exact wavelength can be read off of a digital LED display on the top of the instrument. The instrument is excellent for measuring the exact wavelengths of fine absorption and emission lines. Photo: R. About the authors John I.

Koivula, B. John was bestowed The Richard T. Liddicoat Award from GIA in He also has been awarded the Robert M. Bonanno Award for excellence in gemology by the Accredited Gemologists Association, and Koivula was the first recipient of the Richard T.

John was also the technical and scientific advisor to the famous MacGyver television series from — Many of his books can be seen at www.

Richard W. The author of several books and over articles, his writings and photographs have appeared in a diverse range of publications, and he has received numerous industry awards. Co-winner of the Edward J. In , he received the Antonio C.

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Gem Spectroscope

The KL gem spectroscope has a wavelength scale, fibre optic light source and intensity control with no colour change. The Amici prism 5 prism delivers a sharp spectrum, so that faint lines are easy to view. It has a built-in adapter for scale illumination, and an adapter plate for light source and an integral polariser. The KL standard spectroscope package has exactly the same technical specification as the KL, and comprises Handspectroscope series , spectroscope holder, polariser, analyser, and conoscope. For full technical specifications, please download the relevant datasheet here.

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