Presidium® ARI Diamond Tester

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The ARI by Presidium® identifies colorless diamonds against CVD/HPHT lab-grown colorless diamonds and all types of colorless moissanite. It is suitable for testing on both loose and mounted stones, including jewelry pieces with a closed back setting.

Through advanced proprietary technology, the ARI measures the UV light absorbance ability of diamond and moissanite. With its touch screen color LCD display, ARI provides a clear and accurate results between a Diamond, CVD/HPHT, IIa type or Moissanite within 3 seconds. 1-year manufacturer’s warranty. Made in Singapore.


  • User-safe UV retractable optical probe activates when the tip is in contact with the stone being tested.
  • Alert buzzer indicating loss of contact between optical probe tip and stone during testing.
  • Select between 6 languages (English, Simplified Chinese, French, German, Italian and Spanish.
  • Battery operated with stylish ergonomic design for portability and ease of use (A/C Adapter sold separately, see Related Products).
  • Tests on colorless diamonds and moissanites from D to J color.
  • Operates for both left-handed and right-handed users alike.
  • Comes complete with ARI Hand-held Tester, protective carrying case, stone rest, quick guide and USB cable.


  • Identifies colorless diamonds against lab grown CVD/HPHT diamonds and all types of moissanites, including the new “low conductivity” moissanites
  • Replaceable optical probe tip technology allows users to replace a worn or damaged tip minimizing equipment downtime.
  • Tests on loose or mounted diamonds in all jewelry settings, including closed-back settings.
  • Instantaneous results in 3 seconds for consecutive testing.
  • Tests on polished diamonds and moissanites of all proportional cuts as small as 0.02ct.
Presidium® ARI Diamond Tester
Dimensions: (L x W x H) 190 x 46 x 25mm
(7.5" x 1.8" x 0.9")
Weight without Batteries: 60g (0.13 lbs.)
Power: (3) AAA batteries or AC adaptor (not included)
Battery Life: Up to 4 hours of continuous use
Standby Time: 10 minutes from last measurement (to save battery life).
  • NEW