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https://presidium.com.sg/
Presidium Instruments Pte Ltd, incorporated in 1979, is the world’s leading manufacturer of gemmological instruments that test and measure diamonds and gems, for the diamond and gemstones industries. Catering specially to the jewelry industry, products include: Innovative Diamond Testers …
https://www.amazon.com/Presidium-Gem-Tester-II-PGT/product-reviews/B000TD3G8Q
This gem tester works very well! I am a gemstone and jewelry collector so this was a necessity for me. It has helped me identify between different gemstones that may look similar. For instance, I was able to distinguish between a very pale aquamarine and a very pale blue topaz.3.9/5
https://presidium.com.sg/product-category/colored-gemstone-testers/
The only handheld digital tester in the industry specifically for colored gemstones, and tests for 31 types of gemstones.
https://presidium.com.sg/psdproduct/gem-indicator-pgi/
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 …
https://community.ebay.com/t5/Archive-Fine-Jewelry-Gems/How-accurate-is-a-Presidium-Gem-Tester/td-p/1227795
Nov 24, 2008 · Here’s some relevant notes about electronic diamond/moissanite/gemstone testers you may find useful: Diamond testers and Presidium Gem Tester (also Presidium Duo Tester) are using what’s called thermal conductivity test, when heated probe touches the stone and then tester measures dissipation of the heat through the stone being tested.
https://www.amazon.com/gemstone-tester/s?k=gemstone+tester
Presidium Multi Tester III (PMuT III) All-In-One Handheld Instrument for Testing Diamonds, Moissanites and Diamond Simulants. 3.6 out of 5 stars 83. $209.00$209.00. Get it as soon as Tue, Sep 1. FREE Shipping by Amazon. Only 4 left in stock - order soon.
https://presidium.com.sg/products/
Developed by Presidium to identify diamonds against a wider range of moissanites, including the new “low conductivity moissanite”, and other diamond simulants through its highly sensitive thermoelectrical probe. Learn more>>.
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