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Handheld Digital Tester for Colored Gemstones, Item No. 56.737

NEW from Presidium!

The only handheld digital tester created specifically for colored gemstones.

Get intelligent results in less than 6 seconds with this simple-to-use, easy-to-maintain colored gemstone indicator.

  • Tests for 31 types of gemstones based on their thermal conductivity
  • Color input function of 12 common colors achieves accurate results
  • Easy-to-read clear digital LED screen
  • Presidium patented refined changeable probe tip ensures minimal equipment down time

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



  • Industry's thinnest probe tip (0.45 mm) for testing gemstones from 0.2 ct
  • Patented refined probe tip
  • Metal buzzer alert and low battery indicator
  • Sleek chrome-brushed ergonomic grip
  • USB port for alternative power source and connectivity



Length: 170 mm  (6.69 inch)

Width:    31 mm  (1.20 inch)

Height:   28 mm   (1.10 inch)

Weight:   55 grams  (1.94 oz.)
               (without batteries)