Direct Vision Spectroscope

RDV-1 - A complete and light weight direct vision spectroscope without wavelength scale, for observing visible radiations from 400 to 750mm.

‘Radical’ Diffraction Prism Spectroscope on Stand for Gemology & Gemstones Testing is used to reveal a colored spectrum of a gem by passing artificial light through it. This spectrum is a unique pattern of rainbow-like colors and dark lines or bands for each species of gemstone, so can be used as an identifying criteria. The spectroscope is supplied with a Rotating Stand so as to observe spectra easily in loose gemstones, and to provide hands free operation.

RDV-2 - A compact visible spectroscope which allows the direct reading of spectral length and employs a prism for dispersion. It is also useful for flame test of basic radicals (sodium, strontium, potassium, copper etc.)
There is a single eyepiece and independent focussing tube for the graticule, which carries an index at 590mm. with "D", marked right below the scale, (corresponding to the wave length of sodium light) can be calibrated to a known light source by adjustment of knurled screw. The amount of light admitted to the spectroscope can be regulated by a variable slit, adjusted by a knurled ring round the rating tube.

Gemological spectroscope separates white light into its components spectral colors ranging from 400 to 700nm. When a gem under a test is illuminated properly with white light and observed through a spectroscope, chemical ingredients present in it absorb some wavelengths which are absorbed by the gem appear as dark lines or brands on the spectrum. Such spectral pattern is specific for certain types of stones and help to identify and separate from look a likes.
Absorption spectrum gives an indication of the coloring elements present in the gemstone, thereby assisting in its identification. In some cases spectral pattern helps to separate natural gemstones from their synthetic (dyed) counterparts.
A spectroscope for visible light shows the absorption lines of the elements involved in producing its color. For instance, it helps to separate ruby (chrome) against red or pink sapphire (iron). Spectroscope breaks up the light that is being transmitted from a gemstone to its spectral colors. The process allows the gemologist to see the various wavelengths absorbed by the gemstone. Making this one of the most important tools in identifying gem. Spectroscopes allow you to analyze a loose or mounted stone and they also help to distinguish natural stones from synthetics by the stone a selective absorption of certain wavelengths.

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