Presidium Reflectivity Meter (PRM)

A light and portable instrument that instantly identifies diamonds, moissanites, and gemstones based on their optical properties.

Designed to identify polished gemstones, Presidium Reflectivity Meter measures the quantity of light reflected through the gemstone in order to provide an instant reading of its reflective index.

PRM includes a built-in Reflectivity Chart Listing for the most common gemstones for immediate reference. It can be used without a thermal conductivity tester.


  • Clear and easy-to-read 7 segment LCD display
  • One-touch result display
  • Built-in simulant reflectivity chart
  • Stone rest
  • Battery-operated
  • Portable and lightweight
  • Leather carrying sleeve included
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Built-in reflectivity chart
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Testing pad

Dimensions and Weight

  • Length: 140mm (5.51 inches)
  • Width: 80mm (3.15 inches)
  • Height: 33mm (1.3 inches)
  • Weight: 140g

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  • Identifies diamonds, moissanites, and gemstones instantly
  • Tests polished gemstones of any shape
  • Consistent and reliable results every time
  • Clear and visible display for ease of reading measurements
  • Light and compact tester that can be used anywhere
  • Simple and easy to use

Power and Battery

  • 1 x 9V battery
  • AC adaptor 120 / 230 volts (standard item provided by Presidium)

Package Contents

  • Presidium Reflectivity Meter
  • Built-in simulant reflectivity chart
  • User handbook
  • Warranty card
  • Leather carrying case
Brass pins on vise
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Cylinder cover
Additional Information