Gem Indicator ( PGI )

  • $259.95

• The Presidium Gem Indicator, the only handheld tester in the industry specifically for colored gemstones, 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 changeable probe tip, which ensures minimal equipment downtime. The Presidium Gem Indicator is an enhanced and more convenient handheld version of the revolutionary Presidium Gem Tester/Colored Stone Estimator. 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.
• 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
Power & Battery
• 3 x AAA alkaline batteries (approximately 3 hours of continuous use)
• USB port to be used with USB cable and appropriate Presidium Universal USB Power Adaptor
Recommended Operating Conditions
• Optimal Operating Temperature: 23°C – 27°C (73°F – 80°F)
• Advised to run the calibration process if you are operating in ambient temperatures of 20°C – 33°C (68°F-91°F).
Dimensions & Weight
• Length: 170mm (6.69 inches)
• Width: 31mm (1.20 inches)
• Height:28mm (1.10 inches)
• Weight (without batteries): 55.0grams (1.94 oz)
Gem Indicator ( PGI )


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