CL-181 1.30 ~ 1.81 RI Range Gemological Refractometer + Index oil Flashlight Polarizing Lens

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Refractive  Index is one of the most important optical parameters  used to identify and authenticate polished precious  and semi-precious gemstones. This Gemological refractometer  is a low cost, lightweight measuring instrument used  by jewelers and traders of gemstones   to measure polished stones over a refractive index  range of 1.30 to 1.81 RI. The instrument can also  be used to identify whether a particular stone is Isotropic  or Anistropic (uniaxial or biaxial).

Gemological  (Gemstone) Refractometer is your primary and most powerful  tool in gemstone identification. As with a typical critical  angle refractometer, it will measure the Refractive  Index of faceted stones.

  • Can  identify singly & doubly gemstones quickly  and accurately
  • Uniquely  designed, low battery consumption and portable
  • Approved  by strict quality and safety standards for long  and trouble-free life
  • Guaranteed  high quality and accurate testing results
  • Brand  new and unused



  • Measuring  Range: 1.30 – 1.81 RI
  • Minimum  Graduation Value: 0.01 RI
  • Dimension:  30 x 70 x 130mm
  • Weight:  400g

Set Includes:

    • 1  x Gem Refractometer
    • 1 x Polarizing Filter
    • 1 x Monochromatic Light Filter
    • 1 x Mini  Flashlight
    • 1 x 1.5V AAA Battery
    • 1 x Storage  Box
    • 1 x Refractometer Index Reference List (For 77 common gemstones, i.e. Calcite, Jadeite,  Quartz etc.)
    • 1 x Quick  Start Guide

        Optional Item (not included in set)
            Please click here to buy this optional item   Small  Vial of 1.800 Refractive Index Oil

         or you may contact us at sales(at) if you want an optional items to be included in your order

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