Product Review, GL Spectroscope Lite


Spectroscopes are one of the most difficult gem instruments to master. They come in two varieties: prism and diffraction grating. There is no clear preference between the two, as each has its advantages and disadvantages.

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Diffraction grating spectroscopes are the least expensive. Their primary shortcoming is that the display is so dark you cannot get a reading on some stones. Prism spectroscopes have a brighter display and some have a calibrated scale. Their spectrum is spread out unevenly, making it hard to read in the blue end.

Both are difficult to use. Prism spectroscopes have an adjustable light opening and a focusing control. It requires two hands to make these adjustments. To accomplish this, the stone needs to be in a fixed position and most gemologists prefer the instrument attached to a stand as well.

Diffraction grating spectroscopes are usually hand held. Not having to adjust the focus and light …

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