Presidium Gem Indicator


Presidium Gem Indicator PGI

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Presidium Gem Indicator for colored gemstones

For a proper use: to be used by qualified personnel (with gemmological expertise/knoledge)!

All-New Digital Gemstone Tester that tests up to 31 types of colored gemstones

A revolutionary handheld tester developped specifically for colored gemstones.

It indicates up to 31 different types of colored gems based on their thermal conductivity and even features a color input function that allows users to select from a range of 12 common colors, thereby achieving more accurate results. With an easy-to-read clear digital LED screen, this smart thermal tester also comes with the Presidium patented refined probe tip.

The Presidium Gem Indicator is an enhanced and more convenient handheld version of the revolutionary Presidium Gem Tester/Colored Stone Estimator. It distinguishes between diamonds and other colored gemstones using the principles of thermal conductivity.

The Presidium Gem Indicator probe consists of two linked thermometers; one which is heated electronically, while the other is cooled by the gemstone being tested. The difference in temperature creates an electrical output, which is then amplified and displayed on the new digital organic LED display.

It is simple to use, easy to maintain and quick in giving you intelligent results about your colored gemstones

Dimensions and Weight

Length: 170mm (6.7 inches)
Width: 30.5mm (1.2 inches)
Height: 28mm (1.1 inches)
Weight (without batteries): 55g
Weight (with batteries): 85g


  • Tests an extended range of 31 different gemstones
  • Color input function to further separate gemstones for more accuracy
  • Easy-to-read results on clear digital LED screen
  • Quick results in less than 6 seconds
  • Industry’s thinnest probe tip (0.45mm) for testing gemstones from 0.02ct
  • Patented refined probe tip
  • Metal buzzer alert and low battery indicator
  • Sleek chrome-brushed ergonomic grip
  • USB port for alternative power source and connectivity


  • Also able to distinguish diamonds from other colored gemstones
  • Selection of 12 colors available for color for gemstone tested carats (with micro probe tip)
  • Internal library database function of gemstones and their colors
  • Retractable thermoelectric probe tip that ensures constant pressure between probe and gemstone, for enhanced accuracy
  • Slim, light, portable and handheld for convenience

Power and Battery
3 x AAA batteries (approximately 3 hours of continuous operation)
Presidium Universal Adaptor (optional item can be bought from Presidium)

Operating Conditions
Operating temperature: 23°C- 27°C (73°F- 80°F)

Package Contents:

  • Presidium Gem Indicator
  • Calibration Disk (Disk 1 & Disk 2)
  • USB cable
  • User handbook
  • Warranty card
  • Protective carrying case

Presidium Universal Adaptor



Specific References

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