The new PGT II

Presidium Gem Tester/Colored Stone Estimator II

2.00 LBS
  • Product Description

    Is it a Diamond? Ruby or Garnet? Sapphire or Tanzanite?  Emerald or Jadeite?  The PRESIDIUM GEM TESTER PROVIDES THE ANSWERS!!!

    The Presidium Gem Tester provides a quick, easy, laboratory proven way to identify Diamond and separate the most popular Colored gem stones from one another. This valuable tool can eliminate human error when identifying precious gems.


    The Presidium Gem Tester's accurate performance is based on the fact that different gem stones conduct heat at different rates.

    Simply touch the Gem Tester's sophisticated thermoelectric probe to the surface of any Mounted or Loose stone and the specially calibrated dial will show you the relative heat conductivity of the material.  Stones as small as 1mm can be tested.


    The Presidium Gem Tester can easily distinguish between the following gemstones, a total of 16 species:


    Sapphire            vs. Tanzanite Jadeite vs. Chrysoprase
    Sapphire vs. Iolite Jadeite vs. Aventurine
    Sapphire vs. Spinel Ruby vs. Spinel
    Sapphire vs. Citrine Ruby vs. Garnet
    Sapphire vs. Topaz Topaz vs. Aquamarine
    Sapphire vs. Tourmaline Topaz vs. Amethyst
    Emerald vs. Jadeite Topaz vs. Citrine
    Emerald vs. Garnet Spinel vs. Garnet
    Jadeite vs. Garnet Gemstones vs. Glass

    The Presidium Gem Tester/Color Stone Estimator Is made under rigid quality standards.  It is easy to operate and convenient to own.  The light weight portable unit is powered by two (2) AA 1.5 V batteries or the 100/240V Global A/C adapter provided.  Calibration is made easy with the two test discs mounted into the frame.  The solid state probe pen requires no warm up time between tests and includes a built-in metal detector which will alert you if you have accidentally touched the mounting instead of the stone.        

    1 year factory warranty

    Size: L-125mm x W-90mm x H-70mm

    Weight : 220gms

    What's in the box?

    • Meter with built-in Calibration discs
    • Plug-in Pen Probe
    • Global A/C Adapter
    • Zippered, padded, Nylon Carrying Case
    • Operation Manual


    This product typically ships within 1 business day.


  • Product Reviews


    Write A Review

    1. I Love it

      Easy to use & accurate on Nov 26th 2021

    2. Gives a general idea about your gems

      Basically it is just an "estimator" for different gemstones.
      The only one test that gives you a relatively safe assurance is the fact that it can distinguish between common glass and gems in general.
      When it comes to identifying different types of gems, the "arcs" of groups of gems overlap too much to be very useful.
      The only other positive is that it brings you well into the diamond/moissanite range, in which case you will need another more detailed tester like the Adamas to actually distinguish between diamond and moissanite.
      on Aug 2nd 2021

    3. Won't calibrate properly !!!

      With the test for calibration the needle doesn't go as far as "cal"... I don't know why!!!
      Besides, I didn't receice the sort of patch on which to scrub the tip of the probe...
      Can you help please...!!!

      Response from Mineralab: Sorry to hear of your trouble. A simple Calibration adjustment is probably in order. I am copying Presidium Instruments, the manufacturer in Singapore, to assist you with your issues.
      on Jan 3rd 2021

    4. Inconsistent reading

      A piece of certified jadeite can give the reading of nephrite, jadeite and spinel.
      A nephrite is read as Jadeite and sometimes nephrite.
      I have done all reading under similar weather condition and in 22 degree Celsius air con room.

      What’s the use of this equipment?
      on Jan 17th 2020

    5. Gem Tester II.

      The device works well. I am happy to have purchased the item. on Nov 15th 2019

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