Touch Instrument Tools

Gemological Spectroscope Diffraction 18mm TSD-02


How the Spectroscope Diffraction works:

The dispersive element (triangular prism or grating) can be used to decompose white light into monochromatic light of different wavelengths and form a continuous visible light spectrum. Various pigment ions (over-current elements, some rare elements, and radioactive elements) contained in gemstones have different degrees of selective absorption in the visible light spectrum, and are expressed in absorption lines and absorption bands at different positions in the application. . Both the absorption band and the absorption line in the spectrum of the gemstone have a fixed absorption position. This feature can be used to identify gemstone varieties and help identify the cause of gemstone coloration.



1) Direct observation: When the daytime light is good or in an outdoor environment, the gemstone can be picked up with a pair of tweezers, and the gemstone is placed on the objective lens of the beam splitter in the direction of the sunlight, and the absorption line in the raster image in the eyepiece is observed.

2) Use auxiliary light source (transmission method) Suitable for transparent gemstones.

When the natural light is insufficient, use a full-chromatography xenon lamp for auxiliary observation, pick up the gemstone with the tweezers, place the gem on the objective lens of the spectroscope, and let the artificial light source project from the back of the gemstone to observe the absorption line in the raster image inside the eyepiece.

3) Auxiliary light source reflection method. Suitable for opaque gems.

When observing gems that are opaque or difficult to transmit, you can use the reflection method to place the gemstone on a flat surface, illuminate the surface of the gemstone with a full-chromat light source, and then observe the surface of the gemstone with a spectroscope.


Color: Black

Weight: 25g


Material: Aluminum alloy+Anodized mirror body

Optical specification: Accuracy 2nm Accuracy.

Lens material: optical lens.



1x Spectroscope Diffraction

1x leather case

1x package case


Add to Cart:

  • Model: TSD-02
  • Shipping Weight: 0.5lbs

This product was added to our catalog on Thursday 13 June, 2019.

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