The DuoTester combines the Presidium Reflectivity Meter and the Presidium Gem Tester/Colored Stone Estimator into one convenient identifying instrument, giving you portable Diamond testing with Thermal Conductivity and Reflectivity measuring in the same affordable instrument, the only tool on the market that provides the user with two proven tests for Diamonds and the ability to differentiate between similarly Colored Gemstones! Double the confidence in testing for Diamonds against all known Simulants, including Synthetic Moissanite!
The easy-to-read dial of the DUOTESTER (see close-up photo) is calibrated to indicate the differences in thermal conductivity of the most popular gemstones and simulants. Simply touch the tip of the thermal conductivity probe pen to a mounted or loose stone. Diamond is easily identified by any reading in the green area of the dial, and colored gemstones can be easily differentiated from one another by the clearly labeled zones provided in the red area. Even coated gemstones can be accurately tested.
The Presidium Gem Tester can easily distinguish between the following gemstones, a total of 16 species:
The Thermal Conductivity test of the Presidium DuoTester can be applied not only to Faceted gemstones, but also Cabochons, as well as Gemstone rough.
Your purchase will also include an expanded Reflectivity chart covering the entire universe of stones, 54 species in all, from Glass through Colored Stones, and into Diamond and its various simulants.
This Reflectivity test is designed for use on Faceted stones only, but this instrument tests across the whole range of gemstone species, from lowly Glass, through the full range of Colored stones, into the Diamond simulants, and through Diamond and Synthetic Moissanite.
Fail Safe Calibration
1 year factory warranty
Size: L-165mm x W-77mm x H-77mm
For the DuoTester version with the set of Diamond simulant gemstones, choose that option from the drop-down arrow below.
This product typically ships within 24 hours.
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